Practice one specific thing.
These pages turn broad game categories into useful entry points for a single goal — capitals, science trivia, mental math, Sudoku, deduction, anagrams, visual memory and more. Every page launches the same tested Practice engines rather than a thin duplicate.
Japanese Kanji
Source-backed active recall with typed meaning and reading, safe reverse prompts, local review and a balanced specialist Daily.
Typing Test
Real keyboard practice with transparent WPM, accuracy and browser-local problem-key feedback.
Typing Speed Test
Run 15, 30 or 60-second tests with WPM, raw WPM, accuracy, consistency and adaptive Weak Keys.
V0.144 · TYPING LESSONSTyping Lessons
Work through 18 unlocked accuracy-first keyboarding lessons from home-row anchors to punctuation, numbers and mixed text.
V0.64 · DAILY TYPINGDaily Typing Test
One date-stable 60-second typing target with its own local specialist streak.
Calcudoku
Arithmetic-cage number logic with independently verified unique solutions, Daily play and unlimited seeded Practice.
Kakuro number crosswords
Cross sum arithmetic with no-repeat run logic, unique-solution certification and a separate deterministic Daily.
2048
Slide-and-merge number strategy with deterministic seeded Practice and a reproducible specialist Daily.
Killer Sudoku
Sudoku placement plus cage arithmetic from a solver-verified unique-solution bank.
Minesweeper
Classic minefield deduction with an explicit no-guess generator, local skill metrics and touch-safe controls.
Minesweeper Online
Beginner, Intermediate and Expert play with first-click-safe generation, chording, Daily boards, autosave and 3BV metrics.
V0.58 · NO GUESSNo-Guess Minesweeper
Every accepted board has a complete deduction path from the protected opening under the bundled solver.
Times Tables
Multiplication fluency with selectable 1–12 tables, first-attempt accuracy, actual Weak Facts and a balanced specialist Daily.
Times Tables Practice
Choose tables 1–12, practice direct products or missing factors, run a 60-second sprint and review only facts actually missed.
V0.64 · DAILY TIMES TABLESDaily Times Tables
One date-stable 24-prompt set with every table represented twice and a separate local specialist streak.
Geography
Focused entry points backed by the existing tested game engines.
World Geography Practice
Practice the 195-country map, capitals and flags, then revisit only the items you actually miss through local spaced review.
GEOGRAPHY · WORLDWorld Capitals Quiz
Practice the full 195-country capital core with Quick, Mastery, Deep and full-pool rounds.
GEOGRAPHY · EUROPEEurope Capitals Quiz
Practice European countries and capitals in a focused ten-question geography quiz.
GEOGRAPHY · ASIAAsia Capitals Quiz
Practice Asian countries and capitals with a ten-question regional mastery round.
GEOGRAPHY · AFRICAAfrica Capitals Quiz
Practice African countries and capitals in a focused ten-question regional quiz.
GEOGRAPHY · AMERICASAmericas Capitals Quiz
Practice countries and capitals across the Americas in a ten-question geography round.
V0.31 FULL COVERAGENorth America Capitals Quiz
Practice all 23 countries in the North America study pool with full-region capital recall.
V0.31 FULL COVERAGESouth America Capitals Quiz
Practice all 12 South American countries and capitals in one complete regional round.
GEOGRAPHY · OCEANIAOceania Capitals Quiz
Practice Oceania countries and capitals with a ten-question regional mastery round.
Trivia & Knowledge
Focused entry points backed by the existing tested game engines.
Daily Trivia Quiz
Five date-stable questions from the expanded knowledge bank.
V0.30 TRIVIA DEPTHRandom Trivia Quiz
Fresh seeded Deep 20 across seven explicit topics.
V0.30 TRIVIA DEPTHHistory Trivia Quiz
Dedicated 30-question History pool with Deep 20 play.
TRIVIA · GENERAL KNOWLEDGEGeneral Knowledge Quiz
Play a free general-knowledge quiz with explanations, balanced topics and a ten-question mastery option.
TRIVIA · SCIENCEScience Trivia Quiz
A focused science trivia quiz covering space, biology, chemistry, physics and everyday science.
TRIVIA · MATHMath Trivia Quiz
A math trivia quiz covering number sense, geometry, fractions, percentages and basic mathematical facts.
TRIVIA · GEOGRAPHYGeography Trivia Quiz
A focused geography trivia quiz covering countries, continents, oceans, capitals and world geography facts.
TRIVIA · NATURENature Trivia Quiz
A nature trivia quiz about animals, plants, ecosystems and biological facts with short explanations.
TRIVIA · CULTURECulture Trivia Quiz
A culture trivia quiz covering books, art, music, language and familiar cultural knowledge.
V0.32 · GROUP GRIDWord Connections & Grouping Game
Sort 16 words into four hidden groups from a 128-group bank with One-away feedback, stats and fresh boards.
V0.32 · DAILY GROUPSDaily Word Groups Puzzle
One date-stable 16-word grouping board for the current local day.
V0.42 · GROUP ARCHIVEWord Groups Puzzle Archive
Replay date-stable Daily Group Grid boards with a date picker, guess history and review mode.
Math & Number
Focused entry points backed by the existing tested game engines.
Mental Math Practice
Ten-question mental math practice with addition, subtraction, multiplication, division, squares and percentages.
V0.51 · DECIMALSDecimal Mental Math
Practice one-decimal-place arithmetic in typed-answer rounds or the transparent Adaptive Ladder.
V0.51 · ORDEROrder of Operations Practice
Practice precedence and parentheses with real generated expressions in rounds or Adaptive Ladder.
V0.29 SPEED SPRINTMental Math Speed Test
Answer mixed arithmetic for 60 seconds with visible accuracy, correct-per-minute pace and a local personal best.
V0.29 MULTIPLICATION SPRINTMultiplication Speed Test
Practice multiplication against the clock with mixed tables or a focused 2–12 times-table setting.
MATH · EASYEasy Mental Math
Easy mental math practice with friendly addition, subtraction and multiplication questions.
MATH · HARDHard Mental Math
Hard mental math practice with larger multiplication, division, squares and percentage questions.
V0.52 · MAKE 2424 Game Online
Use every card once to make exactly 24 with exact fractions, verified solvable hands and Zen or timed Practice.
NUMBER · TARGET PUZZLETarget Number Puzzle
Combine four number cards with arithmetic operations to reach an exact target using every card once.
V0.38 · TARGET 6Countdown Numbers Game
Use six number cards to reach a verified 100–999 target with 0–4 large numbers and 30/60-second or Zen play.
Logic
Focused entry points backed by the existing tested game engines.
Sudoku Practice
Play a uniquely solvable 9×9 Sudoku with Easy, Medium and Hard practice pools plus optional logical coaching.
LOGIC · DEDUCTIONLogic Grid Puzzles
Solve interactive 3×3 and 4×4 deduction-grid puzzles with verified unique solutions.
LOGIC · PATTERNSPattern & Sequence Quiz
Practice number sequences, letter patterns and logic questions with calibrated difficulty.
Word
Focused entry points backed by the existing tested game engines.
Anagram Game
Unscramble clue-backed words from a balanced 360-answer Practice bank in Quick 5 or Deep 10 rounds.
V0.45 · ANAGRAM SPRINTAnagram Sprint
Solve as many clue-backed scrambles as you can in 30, 60 or 120 seconds with clean-streak and local PB tracking.
V0.34 · DAILY ANAGRAMDaily Anagram Challenge
Play one date-stable six-word set with two answers from each difficulty band.
WORD · SEARCHWord Search Game
Play 37 themed banks across five real Word Search difficulty profiles.
V0.43 CUSTOM WORD SEARCHWord Search Maker
Create a playable and printable puzzle from your own 3–24 words or phrases, with an exact seeded share link.
V0.34 WORD DEPTHFive-Letter Word Game
Unlimited fresh six-guess rounds with four answer pools, local solve stats and an 8,636-word validation lexicon.
V0.34 DAILY WORDDaily Five-Letter Word
One date-stable five-letter answer with Hard mode and spoiler-free sharing.
V0.57 · JAPANESE WORDSJapanese Vocabulary Quiz
Practice 300 beginner words with meaning, typed reading, reverse recall and local due/weak review.
V0.57 · LEARN BY PLAYINGJapanese Word Game
Daily Words, 60-second Sprint, three retrieval directions and a searchable beginner Word Bank.
V0.57 · JAPANESEHiragana Quiz
Typed recall, row selection, Sprint and Weak Kana across the full hiragana system.
V0.57 · JAPANESEKatakana Quiz
Practice katakana recognition with recall, reverse choice and local weak-character review.
V0.57 · KANAHiragana & Katakana Quiz
Mix both scripts, Daily Kana, Sprint and a full 208-entry reference.
V0.54 WORD LADDERWord Ladder Game
Unlimited 5-letter ladder puzzles with 78 solver-verified sources, route-aware hints and local par records.
V0.54 DAILY LADDERDaily Word Ladder
One date-stable start-to-target ladder with past-day replay and a spoiler-free local result.
Memory & Visual Skill
Focused entry points backed by the existing tested game engines.
Visual Memory Test
Test visual memory with a ten-level flashing-tile endurance challenge that grows from 4×4 to 8×8.
V0.37 · SEQUENCE MEMORYSequence Memory Test
Repeat an ordered 3×3 pattern that grows by one step after every successful level.
V0.45 · NUMBER MEMORYNumber Memory Test
Recall digit strings in a progressive span test or ten-round fixed-setting practice.
V0.53 · MATCHING PAIRSMemory Match Game
Flip face-down cards, remember positions and clear 6, 8 or 12 matching pairs with local move/time bests.
V0.36 · VISUAL COUNT DEPTHVisual Counting Game
Count named target symbols in Classic 5 or Precision 10 across three real density levels.
V0.47 · FLASH COUNTSubitizing Test
See dots for 80–600 ms, answer only after they disappear, and separate small-set from larger-set accuracy.
V0.36 · VISUAL SPEEDVisual Counting Speed Test
Run a 60-second continuous counting sprint with accuracy, exact-per-minute pace, streak and setup-specific local bests.
Focused arithmetic drills
Operation-specific and 2–12 times-table pages backed by the Mental Math generator.
Addition Practice
Practice fast addition with ten focused mental-arithmetic questions and adjustable difficulty.
V0.23 FOCUSED PRACTICESubtraction Practice
Practice subtraction online with ten focused non-negative mental-math questions.
V0.23 FOCUSED PRACTICEMultiplication Practice
Practice multiplication facts and larger mental products in focused ten-question rounds.
V0.23 FOCUSED PRACTICEDivision Practice
Practice exact mental division with ten questions designed to produce whole-number answers.
V0.23 FOCUSED PRACTICEPercentage Practice
Practice common percentages such as 10%, 20%, 25%, 50% and 75% with mental-math questions.
V0.23 FOCUSED PRACTICESquares Quiz
Practice square numbers in a focused ten-question mental-math challenge.
V0.23 FOCUSED PRACTICE2 Times Table Practice
Practice the 2 times table online with ten focused multiplication questions.
V0.23 FOCUSED PRACTICE3 Times Table Practice
Practice the 3 times table online with ten focused multiplication questions.
V0.23 FOCUSED PRACTICE4 Times Table Practice
Practice the 4 times table online with ten focused multiplication questions.
V0.23 FOCUSED PRACTICE5 Times Table Practice
Practice the 5 times table online with ten focused multiplication questions.
V0.23 FOCUSED PRACTICE6 Times Table Practice
Practice the 6 times table online with ten focused multiplication questions.
V0.23 FOCUSED PRACTICE7 Times Table Practice
Practice the 7 times table online with ten focused multiplication questions.
V0.23 FOCUSED PRACTICE8 Times Table Practice
Practice the 8 times table online with ten focused multiplication questions.
V0.23 FOCUSED PRACTICE9 Times Table Practice
Practice the 9 times table online with ten focused multiplication questions.
V0.23 FOCUSED PRACTICE10 Times Table Practice
Practice the 10 times table online with ten focused multiplication questions.
V0.23 FOCUSED PRACTICE11 Times Table Practice
Practice the 11 times table online with ten focused multiplication questions.
V0.23 FOCUSED PRACTICE12 Times Table Practice
Practice the 12 times table online with ten focused multiplication questions.
Flag identification
World and regional flag rounds backed by the Geography engine.
World Flags Quiz
Identify flags across the full 195-country core with Quick, Mastery, Deep and full-pool rounds.
V0.23 FOCUSED PRACTICEEurope Flags Quiz
Identify country flags only from the Europe pool in a focused ten-question geography challenge.
V0.23 FOCUSED PRACTICEAsia Flags Quiz
Identify country flags only from the Asia pool in a focused ten-question geography challenge.
V0.23 FOCUSED PRACTICEAfrica Flags Quiz
Identify country flags only from the Africa pool in a focused ten-question geography challenge.
V0.23 FOCUSED PRACTICEAmericas Flags Quiz
Identify country flags only from the Americas pool in a focused ten-question geography challenge.
V0.31 FULL COVERAGENorth America Flags Quiz
Identify all 23 flags in the North America, Central America and Caribbean study pool.
V0.31 FULL COVERAGESouth America Flags Quiz
Identify all 12 South American flags in a complete regional recognition round.
V0.23 FOCUSED PRACTICEOceania Flags Quiz
Identify country flags only from the Oceania pool in a focused ten-question geography challenge.
Word Search difficulty
Four search-facing difficulty pages map to genuinely different grid sizes, target counts and direction rules.
Easy Word Search
8 words on a 10×10 grid with forward horizontal and vertical placement.
V0.26 WORD SEARCHMedium Word Search
10 words on 12×12 with forward diagonals added.
V0.26 WORD SEARCHHard Word Search
12 words on 14×14 with all eight directions.
V0.26 WORD SEARCHExpert Word Search
14 words on 15×15 with all directions and a hidden word bank.
Word Search themes
Theme-specific Classic puzzles backed by a 16-word theme bank and the same multi-difficulty Word Search engine.
Animals Word Search
Play a free animals word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHSpace Word Search
Play a free space word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHPlanets Word Search
Play a free planets word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHOcean Word Search
Play a free ocean word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHWeather Word Search
Play a free weather word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHFood Word Search
Play a free food word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHScience Word Search
Play a free science word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHMath Word Search
Play a free math word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHSports Word Search
Play a free sports word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHBirds Word Search
Play a free birds word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHFarm Word Search
Play a free farm word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHRainforest Word Search
Play a free rainforest word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHWinter Word Search
Play a free winter word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHSummer Word Search
Play a free summer word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHMusic Word Search
Play a free music word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHSchool Word Search
Play a free school word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHGarden Word Search
Play a free garden word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHBooks Word Search
Play a free books word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHNature Word Search
Play a free nature word search online and find six hidden words in a fresh 10×10 browser puzzle.
V0.23 WORD SEARCHCamping Word Search
Play a free camping word search online and find six hidden words in a fresh 10×10 browser puzzle.
Nonogram picture logic
V0.57 adds a real solver-verified Nonogram specialist before adding only two distinct search entry points.
Nonogram Puzzle Online
Play 5×5, 10×10 or 15×15 picture logic with 120 line-solver-verified sources, drag controls, Undo/Redo, Hint and autosave.
V0.57 DAILY NONOGRAMDaily Nonogram
Open one stable board per size for the date and keep a specialist streak without changing Today’s 6.
V0.154 NONOGRAM LOGICNonogram Logic Coach
Practice five explainable line-deduction techniques with first-attempt mastery, Weak Deductions and balanced Mixed Mastery.
Sudoku & Logic difficulty
Difficulty-specific entry points backed by the existing verified Sudoku and Deduction pools.
Easy Sudoku Online
Play free easy Sudoku online with a verified unique-solution 9×9 puzzle and optional Notes, Auto Notes and Technique Coach.
V0.23 LOGIC DEPTHMedium Sudoku Online
Play free medium Sudoku online with a verified unique-solution 9×9 puzzle and optional Notes, Auto Notes and Technique Coach.
V0.23 LOGIC DEPTHHard Sudoku Online
Play free hard Sudoku online with a verified unique-solution 9×9 puzzle and optional Notes, Auto Notes and Technique Coach.
V0.28 SUDOKU DEPTHExpert Sudoku Online
Play a 24-clue Expert fixture from a 40-puzzle independently verified pool.
V0.28 DAILY SUDOKUDaily Sudoku Puzzle
Open the same date-stable verified Medium Sudoku for the entire day.
V0.28 PRINT MODEPrintable Sudoku Puzzles
Print a clean givens-only 9×9 grid from the same verified browser game.
V0.23 LOGIC DEPTHEasy Logic Grid Puzzles
Solve free easy logic grid puzzles online with interactive deduction cells and independently verified unique solutions.
V0.23 LOGIC DEPTHStandard Logic Grid Puzzles
Solve free standard logic grid puzzles online with interactive deduction cells and independently verified unique solutions.
V0.23 LOGIC DEPTHHard Logic Grid Puzzles
Solve free hard logic grid puzzles online with interactive deduction cells and independently verified unique solutions.
V0.23 LOGIC DEPTHExpert Logic Grid Puzzles
Solve free expert logic grid puzzles online with interactive deduction cells and independently verified unique solutions.
V0.28 DAILY DEDUCTIONDaily Logic Grid Puzzle
Play one date-stable grid from the expanded 160-puzzle verified library.
V0.28 PRINT MODEPrintable Logic Grid Puzzles
Print clean clue sheets and deduction grids from the real interactive puzzle bank.
World country maps
V0.25 adds global free recall plus real map-click practice for the full world and six regional country pools.
Countries of the World Quiz
Name the 195-country core from memory and fill the map.
V0.25 WORLD MAPWorld Countries Map Quiz
Find prompted countries directly on the interactive world map.
REGIONAL MAPEurope Countries Map Quiz
Practice all 44 countries in the Europe pool.
REGIONAL MAPAsia Countries Map Quiz
Practice all 48 countries in the Asia pool.
REGIONAL MAPAfrica Countries Map Quiz
Practice all 54 countries in the Africa pool.
REGIONAL MAPNorth America Countries Map Quiz
Practice the 23-country North America pool.
REGIONAL MAPSouth America Countries Map Quiz
Practice the complete 12-country South America pool.
REGIONAL MAPOceania Countries Map Quiz
Practice the 14-country Oceania pool with small-target helpers.
U.S. geography
Text retrieval plus real state-location, state-outline and capital-to-map Practice modes backed by the same verified 50-state bank.
U.S. States Map Quiz
Find all 50 U.S. states on a clickable map or narrow the drill by region.
V0.25 OUTLINESU.S. State Shapes Quiz
Identify states from isolated, unlabeled outlines with regional distractors.
V0.24 CAPITALS + MAPU.S. State Capitals Map Quiz
Read a capital and locate its state directly on the interactive map.
V0.23 U.S. GEOGRAPHYU.S. State Capitals Quiz
Practice all 50 U.S. states and capitals with mixed two-way multiple choice.
REGIONAL MAPNortheast States Map Quiz
Focused interactive map practice for the 9-state Northeast pool.
REGIONAL MAPMidwest States Map Quiz
Focused interactive map practice for the 12-state Midwest pool.
REGIONAL MAPSouthern States Map Quiz
Focused interactive map practice for the 16-state South pool.
REGIONAL MAPWestern States Map Quiz
Focused interactive map practice for the 13-state West pool.
Four in a Row
Strategy play and validated tactical pattern training on the standard 7×6 board.
Checkers
American 8×8 strategy with forced captures, multi-jumps, browser-local AI and validated tactical training.
Reversi strategy
Play the classic 8×8 disc-flipping strategy game, then solve exact late-game positions all the way to the final disc count.
Reversi Online
Play versus four browser-local AI levels or a friend, with legal-move highlights, Hint, Undo, autosave and exact endgame training.
V0.68 · DAILY ENDGAMEDaily Reversi Tactic
One same-for-the-date exact-solved late-game position with first-try tracking and a separate local streak.
Code Breaker logic
Turn exact-position and right-symbol feedback into constraints, then verify your reasoning with an optional exact candidate engine.
Code-breaking challenges
Unlimited deduction practice or one same-for-the-date Standard code with a separate streak.
Word Grid specialist
Trace adjacent letters on solver-validated boards, separate familiar completion words from Bonus vocabulary, or return to one fixed Daily Grid.
Word Grid Game
Learn the adjacency rules and play from 6,144 frozen solver-validated source boards.
V0.70 · DAILY WORDDaily Word Grid
One deterministic 4×4 board for the date with its own local solve history and specialist streak.
PLAYMahjong Solitaire Game
Open the full guaranteed-solvable layered tile game directly.
Play game →PUZZLEMahjong Solitaire
Guaranteed-solvable 144-tile layered matching with hints, Undo and local clean times.
Open challenge →DAILY SPECIALISTDaily Mahjong Solitaire
One deterministic solvable layered deal per date with a separate local streak.
Open daily →Cryptogram word logic
Decode consistent letter substitutions through word shapes, repeated symbols and frequency, then uncover a reviewed knowledge fact or question.
Cryptogram Puzzle
Four real difficulty tiers, a 956-item frozen knowledge bank, Pattern Coach, Hint, Check, Undo, autosave and clean local PBs.
V0.71 · DAILY CIPHERDaily Cryptogram
One same-for-the-date plaintext and substitution key with its own browser-local streak, separate from Today’s 6.
Spider Solitaire strategy
Classic 104-card Spider with real same-suit run movement, hidden-card exposure, empty-column planning and five stock rows.
FreeCell strategy
Classic numbered open-information card strategy with four free cells, legal supermoves and a separate deterministic Daily.
FreeCell Online
Play the original Microsoft-compatible 1–32,000 deal sequence with tap/drag controls, supermove limits, Hint, Safe Home, Undo and autosave.
V0.76 · DAILY FREECELLDaily FreeCell
One date-stable known-solvable classic deal with its own local history and specialist streak, separate from Today’s 6.
Mancala strategy
Six-pit Kalah with extra turns, captures, browser-local AI and exact-solved late-game calculation.
Dominoes strategy
Match open pips in Draw or Block, then use exact endgames to sharpen endpoint control.
Geography mastery
Recognize country shapes or switch into a fast mixed capital-and-flag sprint backed by the same 195-country Geography engine.
Klondike Solitaire
Turn 1 or Turn 3 classic Klondike with Daily Solitaire, autosave, Hint and local clean records.
Play →Letter Hive vocabulary
Build words from seven letters while always using the center. Familiar Main answers drive mastery; lower-frequency accepted words remain optional Bonus finds.
Letter Hive Word Game
Play 512 frozen seven-letter hives with pangrams, transparent scoring, Hint, autosave and Main/Bonus vocabulary separation.
V0.82 · DAILY LETTER HIVEDaily Letter Hive
One deterministic hive for the date with browser-local history and a specialist streak separate from Today’s 6.
Hearts strategy
Avoid penalty tricks, manage the Queen of Spades and track public suit information in a full four-player trick-taking game.
Hearts Card Game
Practice one hand or play to 100 against three fair browser-local AI levels with passing, shoot-the-moon scoring, Hint, Undo and autosave.
V0.83 · DAILY HEARTSDaily Hearts
One deterministic hand for the date with browser-local completion history and a specialist streak separate from Today’s 6.
Spades partnership strategy
Bid a team contract, manage trump, protect or attack Nil, and control bags against fair browser-local computer players.
Backgammon race & contact strategy
Use complete dice sequences, bar priority, blocking, hits and bearing off against a fair browser-local computer.
Chess strategy
Play a complete game with legal check, castling, en passant, promotion and draw detection against browser-local AI.
Go · Baduk · Weiqi
Capture groups, protect liberties and balance territory on compact boards with transparent browser-local rules.
Xiangqi · Chinese Chess
Practice palace control, cannon screens, horse-leg tactics and flying-general safety on the full 9×10 river board.
Shogi · Japanese Chess
Practice reserve-piece drops, promotion choices, nifu awareness and king safety on the full 9×9 board.
Gin Rummy draw-and-discard strategy
Build sets and suited runs, track deadwood, and decide when to knock against a fair browser-local opponent.
Cribbage counting & pegging strategy
Choose two cards for the crib, manage the running count to 31, then count fifteens, pairs, runs, flushes and nobs exactly.
Euchre partnership & trump strategy
Call trump, learn the right and left bowers, decide when to go alone and take three of five tricks with your partner.
Block Puzzle spatial planning
Place fixed-orientation shapes on an 8×8 board, clear complete rows and columns, and preserve flexible landing zones for the whole three-piece tray.
Block Puzzle Online
Play deterministic 8×8 Practice runs or a 50-Piece Challenge with three-piece trays, transparent clears, Hint, Undo and autosave.
V0.96 · DAILY BLOCK PUZZLEDaily Block Puzzle
One date-stable piece stream with local history and a specialist streak separate from Today’s 6.
Pyramid Solitaire pair-to-13 strategy
Clear a seven-row card pyramid by pairing exposed ranks to thirteen, timing the stock carefully and deciding which removals unlock the strongest follow-up cards.
Pyramid Solitaire Online
Play deterministic one-pass or three-pass Practice with pair-to-13 rules, King removal, Hint, Undo and autosave.
V0.96 · DAILY PYRAMIDDaily Pyramid Solitaire
One date-stable one-pass deal with browser-local history and a specialist streak separate from Today’s 6.
Yacht Dice scorecard strategy
Hold useful dice, manage thirteen one-use categories and balance upper-bonus progress against combination scores.
Binary Puzzle · Takuzu
Balance 0s and 1s, avoid triples and keep every completed row and column unique on independently verified boards.
Hitori number elimination
Shade duplicate numbers while keeping black cells apart and every unshaded cell in one connected area.
Skyscrapers skyline logic
Fill a Latin-square city and match each edge clue to the number of buildings visible from that viewpoint.
Skyscrapers Puzzle Online
Play verified 4×4 through 6×6 Towers puzzles with Easy, Medium and Hard pools, Pencil Notes, Hint, Check, Undo/Redo and autosave.
V0.99 · DAILY SKYSCRAPERSDaily Skyscrapers
One date-stable verified skyline with local history and a specialist streak separate from Today’s 6.
Futoshiki inequality logic
Place every number once per row and column while inequality chains restrict which values can fit neighboring cells.
Slitherlink loop deduction
Use numbered cell counts, dot degree rules and the one-loop constraint on independently verified boards.
Light Up · Akari
Place bulbs so every white cell is illuminated while numbered black walls and line-of-sight exclusions constrain each choice.
Hashi · Bridges
Connect numbered islands with one or two bridges while preventing crossings and keeping the final network fully connected.
Star Battle · Two Not Touch
Place one star in every row, column and connected region while the no-touch rule eliminates all eight neighboring cells.
Reaction Time · visual and choice response
Measure repeatable browser response latency with simple visual trials, a longer stability set and a four-direction choice mode.
Reaction Time Test
Quick 5, Stability 10 and Choice 8 with false-start handling, background-tab invalidation, touch/keyboard input and local personal bests.
V0.104 · DAILY REACTIONDaily Reaction Time
Five date-stable wait intervals with browser-local history and a specialist streak that stays outside Today’s 6.
Aim Trainer · pointer accuracy & tracking
Build repeatable pointer coordination with deterministic target courses, explicit misses, smaller Precision targets, visual Switching and moving-target Tracking.
Aim Trainer
Baseline 30, Precision 24, Switching 24 and Tracking 20s with deterministic courses, literal accuracy metrics and browser-local personal bests.
V0.105 · DAILY AIMDaily Aim Trainer
One date-stable thirty-target Baseline course with local history and a specialist streak separate from Today’s 6.
Dual N-Back · position & sound updating
Track the current grid position and synthesized tone against what appeared N trials earlier, with exact hit, miss and false-alarm scoring.
Dual N-Back
Visual 30, Audio 30, Dual 30 and Adaptive 3×18 across 1-back through 5-back with deterministic cue streams and transparent response scoring.
V0.106 · DAILY N-BACKDaily Dual N-Back
One date-stable Dual 30 session at 2-back or 3-back with browser-local history and a specialist streak separate from Today’s 6.
Stroop · color-word interference
Answer ink color while ignoring conflicting word meaning, or switch rules only when the stimulus is boxed.
Stroop Test
Classic 30, Mixed 40, Rule Switch 36 and Endurance 60 with deterministic balances, literal accuracy and reaction-time summaries, and local personal records.
V0.107 · DAILY STROOPDaily Stroop
One date-stable balanced Classic 30 course with local history and a specialist streak separate from Today’s 6.
Chimp Test · number-order spatial memory
Encode numbered locations on a 6×6 board, then continue in ascending order after the labels disappear.
Verbal Memory Test
Continuous Seen/New word recognition with Classic 3 Lives, Focus 50, Long Lag 72 and Sprint 60s from a deterministic 2,048-word bank.
Play Verbal Memory → Open guide →Daily Verbal Memory
One date-stable 64-trial Seen/New stream with browser-local history and a specialist streak outside Today’s 6.
Open Daily guide →Schulte Table · ordered visual search
Scan a deterministic shuffled grid and find every target in the required order without letting wrong taps advance the sequence.
Schulte Table Test
Classic 5×5, Reverse 5×5, Letters 5×5 and Alternating 6×6 with deterministic boards, explicit errors and browser-local personal bests.
V0.110 · DAILY SCHULTEDaily Schulte Table
Four date-stable boards covering every mode exactly once with local history and a specialist streak separate from Today’s 6.
Crossword · fully crossed word grids
Solve intersecting Across and Down clues in compact Mini, Standard and Deep grids with deterministic Practice and a separate date-stable Daily.
Crossword Online
Mini 5×5, Standard 7×7 and Deep 9×9 with keyboard/touch input, clue navigation, Check, Reveal, autosave and clean local PBs.
V0.111 · DAILY CROSSWORDDaily Crossword
One date-stable source with a Mini/Standard/Deep rhythm, local history and a specialist streak separate from Today’s 6.
Jigsaw Puzzle
Spatial assembly with original procedural scenes, true interlocking edges, optional rotation and local autosave.
Jigsaw Puzzle
Assemble Easy 12, Standard 24 or Challenge 48-piece scenes with drag-and-snap controls.
Open Jigsaw →V0.112 · GUIDEJigsaw Puzzle Online
Learn the piece geometry, rotation, preview, hint, autosave and Clean-versus-Assisted rules.
Explore →V0.112 · DAILYDaily Jigsaw
One date-stable original scene with its own local history and streak, outside Today’s 6.
Play daily →Ear Training
Music-listening practice from locally synthesized interval tones with transparent scoring and no external audio pack.
Water Sort · color sorting logic
Use two empty tubes as temporary buffers while consolidating every color into one completed tube.
Sliding Puzzle · 15 Puzzle
Move numbered tiles through one gap on guaranteed-solvable 3×3, 4×4 and 5×5 boards.
Sokoban · box-pushing planning
Push every box onto a goal while preserving the player routes you need for later pushes. Exact minimum pushes come from an independent solver.
Sokoban Puzzle
45 solver-verified sources across 2-box, 3-box and 4-box modes with eight symmetry transforms, Undo, Hint, autosave and exact minimum pushes.
V0.116 · DAILY SOKOBANDaily Sokoban
One date-stable verified box-pushing board with local history and a specialist streak separate from Today’s 6.
Peg Solitaire · jump-elimination planning
Reduce a verified Triangle, English or European board to one peg on its target, or replay the full 32-peg Classic English center-vacancy challenge.
Peg Solitaire Online
60 project-generated verified sources across Triangle 15, English 33 and European 37, plus Classic English, Undo, Hint and autosave.
V0.117 · DAILY PEG SOLITAIREDaily Peg Solitaire
One date-stable verified jump-elimination board with local history and a specialist streak separate from Today’s 6.
Snake · real-time arcade path planning
Steer a growing snake through deterministic food, speed ramps and connected obstacle mazes with keyboard, swipe and touch controls.
Snake Game
Classic survival, Sprint 15 and three verified Maze difficulty pools with buffered turns, Pause, local bests and quick restart.
V0.118 · DAILY SNAKEDaily Snake
One date-stable obstacle board and deterministic food sequence with its own local history and streak outside Today’s 6.
Periodic Table · chemistry recall and table position
Learn all 118 elements, then practice symbol ↔ name, atomic number, table position, mixed recall and a date-stable Daily 10 entirely in the browser.
Name All Elements
Fill a blank periodic table by producing names or symbols in any order, with Endless completion and a 60-second free-recall Sprint.
V0.119 · CHEMISTRYPeriodic Table Quiz
Foundations 1–20, Core 1–54 or Full 1–118 with typed symbol/name recall, atomic numbers, table-position taps and local weak-item review.
V0.119 · DAILY CHEMISTRYDaily Periodic Table
Ten deterministic element questions per date with a separate local history and streak outside Today’s 6.
Morse Code · audio copy and real key timing
Learn the verified 49-character written Morse bank, hear signals at adjustable character and spacing speeds, type what you hear, encode what you see and practice press-duration keying.
Morse Code Practice
Reference, Listen → Type, See → Morse, Copy 5, Key Practice, Mixed 10 and Weak Review across Starter, Letters, Alphanumeric and Extended pools.
V0.122 · DAILY MORSEDaily Morse Code
Ten deterministic Morse questions per date with local autosave, history and a specialist streak separate from Today’s 6.
Tents & Trees · camping deduction
Place one tent per tree, match edge counts and keep every tent apart.
Nurikabe · Islands & Walls
Balance exact island sizes, one connected Sea and the no-2×2-pool rule on independently unique boards.
Shikaku · rectangle partition logic
Partition every cell into one-clue rectangles whose areas match their numbers, using live candidate pressure and independently unique boards.
Shikaku Puzzle
6×6, 8×8 and 10×10 rectangle partition boards with drag drawing, candidate counts, technique-aware Verified Hint and local autosave.
V0.124 · DAILY SHIKAKUDaily Shikaku
One date-stable independently unique rectangle puzzle with local history and a specialist streak outside Today’s 6.
Thermometers · bulb-to-tip deduction
Match exact row and column Mercury counts across straight and curved thermometers with verified local sources and technique-aware hints.
Number Path · sequential path deduction
Complete one 1→N² orthogonal chain using clue gaps, parity, forced candidate cells and independently unique local sources.
Pipes · network rotation deduction
Rotate endpoints, straights, corners and junctions into one connected leak-free network using boundary forcing, orientation domains and live powered connectivity.
Fillomino · connected number regions
Practice exact-size region growth with independently unique boards and live local reasoning feedback.
Maze · perfect-labyrinth navigation
Navigate independently verified perfect mazes while measuring route efficiency, backtracking and dead-end recovery.
Dominosa · exact-cover domino pairs
Pair every cell once while using every unordered number pair exactly once, with X marks, a live pair ledger and independently verified unique solutions.
Note Reading
Build treble/bass staff fluency with ledger lines, accidentals, key signatures, a virtual piano and local weak-note focus.
Mental Math · Make 24
Combine four numbers into exactly 24 with exact rational arithmetic, solver-defined difficulty and state-aware verified hints.
Make 24
Easy, Standard and Challenge sources with exact fractions, Undo/Redo, deterministic seeds, local records and separate Daily play.
Practice →GUIDEMake 24 Puzzle Guide
Learn combine-order, factor planning, exact fractions and how solver-defined difficulty differs between source families.
Learn →DAILY MATHDaily Make 24
One date-stable exact-arithmetic puzzle with browser-local autosave, history and a specialist streak.
Play Daily →Tower of Hanoi planning
V0.133 adds generated three-peg and four-peg Hanoi states with exact BFS par, live detour telemetry, Verified Hint and a separate specialist Daily.
Water Jug measuring
Exact Fill / Empty / Pour state-space planning with live par and a date-stable specialist Daily.
Rhythm reading and tap timing
Read exact beat grids, tap marked onsets against an optional metronome, and review measured early/late timing rather than a vague pass/fail result.
Mental Rotation · 3D spatial reasoning
V0.136 adds generated chiral voxel sculptures with exact 24-rotation equivalence, mirror and changed-shape distractors, response-time analysis and a separate deterministic Daily.
Mental Rotation Trainer
Identify the exact same connected cube sculpture under a proper 3D rotation while avoiding mirror and near-miss connectivity traps.
V0.136 · DAILY SPATIALDaily Mental Rotation
One date-stable verified spatial challenge with 365 distinct 2026 configurations, local history and a separate specialist streak.
Object Tracking · dynamic visual attention
V0.137 adds 90 generated collision-screened paths, 2–4 target tracking, fixed or Adaptive speed, Clean/Assisted records and a separate deterministic Daily.
Multiple Object Tracking
Track temporarily marked targets through identical moving distractors with adjustable speed and exact hit/false-pick feedback.
Daily Object Tracking
One date-stable verified tracking configuration with 365 distinct 2026 configurations and a separate local streak.
Task Switching · cognitive flexibility
Switch between deterministic response rules and review repeat versus switch accuracy and timing.
Go / No-Go · response inhibition
Press for frequent Go stimuli and withhold for rare No-Go conditions while keeping commission and omission errors separate.
Digit Span · ordered memory
Recall project-generated digit sequences Forward or Backward while keeping exact accuracy, maximum span and recall timing visible.
Flanker · selective attention conflict
Keep the response anchored to the center target while surrounding symbols agree, disagree or stay neutral.
Visual Search · target present or absent
Find one exact target among controlled distractors, then compare accuracy and search time across set sizes.
Change Detection
Minesweeper Patterns
Train 88 verified direct, 1–1-family and 1–2-family deductions, then read local 3BV/s, efficiency and chord-yield analytics.
Sudoku Technique Academy
Practice verified candidate patterns from Singles through Swordfish and Skyscraper without adding a thin page for every technique.
Multiplication Fact Mastery
Build 1×–12× recall through Study, Direct Recall, Missing Factor, Fluency 60 and a mixed Mastery Check, with real Weak Facts feeding the next recommendation.
Multiplication Fact Mastery guide → Open Fact Mastery →2048 Strategy
Practice move selection instead of memorizing slogans: five transparent board-management principles backed by the existing classic 2048 engine.
Chess Tactics
Pattern recognition from the existing complete Chess engine: 96 synthetic legal positions, four transparent motif rules and local Weak Tactics review.
FreeCell Decision Lab
Train move selection on reachable classic positions with an exact legal provenance path and Weak Decisions review.