Find the exact challenge you want.
DailyBrainArc is built around a short daily habit, but discovery should not depend on knowing the homepage first. Explore by skill, subject or puzzle type, then jump directly into the real Practice game.
Explore by skill
Each hub groups distinct games and focused challenge entry points without creating duplicate game engines.
Hitori
Shade duplicate numbers on 4×4 through 7×7 verified boards while black cells stay separated and the remaining white area stays connected.
Open Hitori →V0.98 · GUIDEHitori Online
Learn duplicate-pair, no-touch and connectivity deductions with explicit Shade and Keep tools.
Explore →V0.98 · DAILYDaily Hitori
One date-stable verified number-elimination board with local specialist history.
Play daily →V0.98 · INEQUALITY LOGICFutoshiki
Fill Latin-square grids from 4×4 through 7×7 while satisfying horizontal and vertical inequality clues on independently verified boards.
Open Futoshiki →V0.98 · GUIDEFutoshiki Online
Learn row/column uniqueness, inequality chains, candidate ranges and the clean-versus-assisted record contract.
Explore →V0.98 · DAILYDaily Futoshiki
One date-stable verified inequality puzzle with browser-local history and a specialist streak separate from Today’s 6.
Play daily →NEW · LEARNLearn by Playing
Japanese kana, mental math, geography and knowledge games with local progress.
Explore learning →WORDWord Games
Cryptogram, Word Grid, five-letter guessing, solver-verified word ladders, anagrams and word-search puzzles for vocabulary, pattern reasoning and quick language play.
Explore Word Games →NUMBER & MATHMath & Number Games
Mental arithmetic, unique-solution Calcudoku, verified target-number puzzles and 2048 slide-and-merge play with calibrated or deterministic practice routes.
Explore Math & Number Games →KNOWLEDGETrivia & Knowledge Games
General knowledge, topic-focused trivia, classic Link Up and 4×4 word-grouping puzzles with explanations and review.
Explore Trivia & Knowledge Games →GEOGRAPHYGeography Games
World-country map and free-recall drills, capitals and flags, plus interactive U.S. state geography.
Explore Geography Games →LOGICLogic & Sudoku Games
Mancala, Spider Solitaire, FreeCell, Mahjong Solitaire, Code Breaker, Reversi, Checkers, Four in a Row, verified deduction grids and unique-solution Sudoku.
Explore Logic & Sudoku Games →MEMORY & SKILLMemory & Visual Skill Games
Visual memory and attention games that get denser or harder as you progress.
Explore Memory & Visual Skill Games →Explore by skill
Each hub groups distinct games and focused challenge entry points without creating duplicate game engines.
Skyscrapers
Fill verified 4×4 through 6×6 Latin-square cities while edge clues count how many buildings are visible from each viewpoint.
Open Skyscrapers →V0.99 · GUIDESkyscrapers Puzzle Online
Learn visibility counts, opposite-edge deductions, Pencil Notes and the unique-solution release contract.
Explore →V0.99 · DAILYDaily Skyscrapers
One date-stable verified skyline with browser-local history and a specialist streak separate from Today’s 6.
Play daily →V0.98 · INEQUALITY LOGICFutoshiki
Fill Latin-square grids from 4×4 through 7×7 while satisfying horizontal and vertical inequality clues on independently verified boards.
Open Futoshiki →V0.98 · GUIDEFutoshiki Online
Learn row/column uniqueness, inequality chains, candidate ranges and the clean-versus-assisted record contract.
Explore →V0.98 · DAILYDaily Futoshiki
One date-stable verified inequality puzzle with browser-local history and a specialist streak separate from Today’s 6.
Play daily →NEW · LEARNLearn by Playing
Japanese kana, mental math, geography and knowledge games with local progress.
Explore learning →WORDWord Games
Cryptogram, Word Grid, five-letter guessing, solver-verified word ladders, anagrams and word-search puzzles for vocabulary, pattern reasoning and quick language play.
Explore Word Games →NUMBER & MATHMath & Number Games
Mental arithmetic, unique-solution Calcudoku, verified target-number puzzles and 2048 slide-and-merge play with calibrated or deterministic practice routes.
Explore Math & Number Games →KNOWLEDGETrivia & Knowledge Games
General knowledge, topic-focused trivia, classic Link Up and 4×4 word-grouping puzzles with explanations and review.
Explore Trivia & Knowledge Games →GEOGRAPHYGeography Games
World-country map and free-recall drills, capitals and flags, plus interactive U.S. state geography.
Explore Geography Games →LOGICLogic & Sudoku Games
Mancala, Spider Solitaire, FreeCell, Mahjong Solitaire, Code Breaker, Reversi, Checkers, Four in a Row, verified deduction grids and unique-solution Sudoku.
Explore Logic & Sudoku Games →MEMORY & SKILLMemory & Visual Skill Games
Visual memory and attention games that get denser or harder as you progress.
Explore Memory & Visual Skill Games →Popular focused challenges
Start with a narrow intent such as naming countries, finding countries on a map, U.S. states, science trivia or visual memory.
Mancala Game
Play six-pit Kalah with local AI or a friend, then study exact late-game tactics.
V0.76 · PLAY NOWMancala Practice
Open the full Kalah board with extra turns, captures, Hint, Undo and autosave.
V0.76 · DAILY MANCALADaily Mancala Tactic
One date-stable exact late-game position with a separate specialist streak.
V0.76 · SPIDER STRATEGYSpider Solitaire
Build same-suit descending runs across a 104-card ten-column board with 1/2/4-suit difficulty.
V0.76 · PLAY NOWSpider Practice
Open the full 104-card board in Standard 2-suit Practice, then switch to 1 or 4 suits without leaving the specialist.
V0.76 · DAILY SPIDERDaily Spider Solitaire
Return to one deterministic 2-suit deal for the date with a separate local specialist streak.
V0.76 · OPEN-CARD STRATEGYFreeCell Online
Play Microsoft-compatible classic numbered deals with visible cards, legal supermoves, Hint, Undo and local clean bests.
V0.76 · DAILY FREECELLDaily FreeCell
One date-stable classic deal from the known-solvable original set, with a separate local specialist streak.
V0.64 · DIGITAL SKILLTyping Speed Test
Measure WPM, raw speed, accuracy and consistency, then practice only letters actually missed in this browser.
V0.64 · DAILY TYPINGDaily Typing Test
One date-stable 60-second target with a separate local typing streak and no Today’s 6 impact.
V0.60 · SLIDE + MERGE2048 Game Online
Classic 4×4 plus compact 3×3 and relaxed 5×5 seeded Practice with swipe, Undo and clean local bests.
V0.60 · DAILY 2048Daily 2048
One date-stable Classic seed with reproducible spawns and a separate local specialist streak.
V0.58 · NO-GUESS LOGICMinesweeper Online
Play first-click-safe Beginner, Intermediate and Expert boards that are verified solvable without guessing.
V0.58 · DEDUCTION ONLYNo-Guess Minesweeper
Practice boards rejected unless the built-in solver can finish from the protected opening using forced deductions.
V0.76 · OUTLINE RECALLCountry Outline Quiz
Identify real country geometry from four choices, then route misses into Geography Review.
V0.76 · 60-SECOND RECALLGeography Blitz
Mix capitals and flags for one minute with accuracy-weighted scoring and local review follow-up.
V0.36 MASTERYWorld Geography Practice
Practice world locations, capitals and flags, then revisit only your actual misses with transparent local review intervals.
V0.25 FREE RECALLCountries of the World Quiz
Name the 195-country core from memory and watch the map fill.
V0.25 WORLD MAPWorld Countries Map Quiz
Find prompted countries on a real interactive world map.
V0.24 VISUAL GEOGRAPHYU.S. States Map Quiz
Find prompted states on a real clickable U.S. map with 10, 25 or all-50 practice.
POPULAR ENTRYWorld Capitals Quiz
Practice the full 195-country capital core with Quick, Mastery, Deep and full-pool rounds.
POPULAR ENTRYGeneral Knowledge Quiz
Play a free general-knowledge quiz with explanations, balanced topics and a ten-question mastery option.
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.
V0.29 SPEED SPRINTMental Math Speed Test
Test mixed arithmetic for 60 seconds with visible speed and accuracy.
POPULAR ENTRYMental 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.
POPULAR ENTRYLogic Grid Puzzles
Solve interactive 3×3 and 4×4 deduction-grid puzzles with verified unique solutions.
POPULAR ENTRYSudoku Practice
Play a uniquely solvable 9×9 Sudoku with Easy, Medium, Hard and Expert pools, 160 verified grids, plus optional logical coaching.
V0.147 · TECHNIQUE ACADEMYSudoku Techniques
Train nine human-solvable techniques across 72 verified candidate states, including Swordfish and Skyscraper, with Clean versus Assisted mastery.
POPULAR ENTRYVisual Memory Test
Test visual memory with a ten-level flashing-tile endurance challenge that grows from 4×4 to 8×8.
V0.37 ORDERED RECALLSequence Memory Test
Repeat an ordered 3×3 button pattern that grows after every successful level.
V0.45 · DIGIT RECALLNumber Memory Test
Test progressive digit span or repeat one fixed digit length and display time for ten rounds.
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.
V0.47 · 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
Count target symbols continuously for 60 seconds and track exact-count accuracy, pace and streak.
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
Change one letter at a time across solver-verified five-letter ladders with par, route-aware hints and unlimited Practice.
V0.54 · DAILY LADDERDaily Word Ladder
Play one date-stable ladder with local streak history and past-day replay, separate from Today’s 6.
V0.45 ANAGRAM DEPTHAnagram Game
Unscramble clue-backed words in Quick 5 or Deep 10 from a balanced 360-answer Practice bank.
V0.45 ANAGRAM SPRINTAnagram Sprint
Race a 30, 60 or 120-second clock and save raw setup-specific Sprint bests locally.
POPULAR ENTRYScience Trivia Quiz
A focused science trivia quiz covering space, biology, chemistry, physics and everyday science.
public and indexable until brand/domain and production launch are approved. The purpose is to build useful search-facing inventory before indexing, not to publish thin SEO pages early.Multiplication fluency
Build accurate recall across the 1–12 tables, then target real misses.
Four in a Row strategy
Play a complete strategy game, then isolate wins, blocks and double threats in validated tactical positions.
Checkers strategy
Play full American checkers, then isolate forced captures, multi-jumps and safe-move calculation in validated tactics.
Reversi strategy
Classic 8×8 mobility, corners and exact endgame counting.
Reversi endgame training
Play full games, then calculate exact late endings from the same local rules engine.
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.
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.
Want the full numbered-deal table?
Open the real FreeCell board, enter any classic deal from 1–32,000, or play today’s deterministic deal.
Kakuro number logic
Fill cross-number runs so every clue sum is exact with no repeated digit, backed by independently uniqueness-verified puzzles.
Dominoes strategy
Control two chain endpoints in Draw or Block play, then calculate exact late-game endings.
Know the country — not just the answer choice.
Practice real map outlines, a 60-second flag/capital Blitz, and a searchable 195-country Study Atlas.
Klondike Solitaire
Turn 1 or Turn 3 classic Klondike with Daily Solitaire, autosave, Hint and local clean records.
Play →WORDLetter Hive
Build words from seven letters with a required center, pangrams, familiar Main answers, Bonus vocabulary and a separate Daily.
Play →STRATEGYHearts
Classic four-player Hearts against fair local AI with deterministic Practice and Daily hands, Hint, Undo and local records.
Play →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 strategy
Learn liberties, capture, connection and territory on compact 9×9 and 13×13 boards.
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
Manage five dice and thirteen one-use score rows with deterministic Practice, Daily play and a fair browser-local AI.
Open Yacht Dice →Binary Puzzle
Verified 6×6–12×12 Takuzu with balanced 0/1 counts, no triples, unique completed lines, Daily play and local autosave.
Open Binary Puzzle →Slitherlink · Loop the Loop
Draw one continuous loop while numbered cells constrain edge counts and every used dot has exactly two segments.
Light Up · Akari illumination logic
Balance numbered-wall clues with long row-and-column light rays until every white cell is illuminated and no bulbs see each other.
Hashi · Bridges network logic
Balance island degree clues with non-crossing bridge geometry and whole-board connectivity until every island belongs to one network.
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 · reflex & choice response
Practice simple visual response speed or four-direction choice reaction with repeatable browser-local sessions.
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 · seen or new word recognition
Track a growing set of common words and decide whether each item is genuinely new or has appeared earlier in the run.
Verbal Memory Test
Classic 3 Lives, Focus 50, Long Lag 72 and Sprint 60s with deterministic streams, truthful Seen/New labels and local response-class records.
V0.109 · DAILY VERBALDaily Verbal Memory
One date-stable 64-trial stream with local history and a specialist streak separate from Today’s 6.
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 with honest clue provenance, deterministic Practice and a separate specialist Daily.
Crossword
Play Mini 5×5, Standard 7×7 or Deep 9×9 with keyboard and touch input.
Open Crossword →V0.111 · GUIDECrossword Online
Learn the Across/Down controls, clean-versus-assisted records, autosave and frozen-bank contract.
Explore →V0.111 · DAILYDaily Crossword
One source for the date with a separate specialist streak and no change to Today’s 6.
Play daily →Jigsaw & Spatial Assembly
Build complete scenes from interlocking pieces using visual matching, edge shape and optional rotation.
Jigsaw Puzzle
12, 24 or 48 pieces, original procedural scenes, preview, hints, rotation and autosave.
Play →FOCUSED GUIDEJigsaw Puzzle Online
Practice edge matching, orientation and neighborhood reconstruction in a local-first browser puzzle.
Explore →DAILYDaily Jigsaw
A deterministic scene for the date with a separate specialist history and streak.
Play daily →Ear Training & Music Listening
Practice musical interval recognition from locally synthesized tones with melodic, harmonic and mixed drills.
Ear Training
Easy 8, Standard 12 and Challenge 16 interval sessions with ascending, descending, harmonic and mixed playback.
Play →FOCUSED GUIDEInterval Ear Training
Learn the semitone, melodic-versus-harmonic and deterministic Practice contract behind the real game.
Explore →DAILYDaily Ear Training
A date-stable 12-round mixed session with separate local history and no change to Today’s 6.
Play daily →Water Sort · Buffer Planning
Sort layered colors into uniform tubes with exact-par source boards, two empty buffers, Undo, Hint and color-blind symbols.
Water Sort Puzzle
Easy 4-color, Standard 5-color and Challenge 6-color boards from a frozen solver-verified source bank with deterministic seeded transforms.
V0.115 · DAILY WATER SORTDaily Water Sort
One date-stable solver-verified sorting board with local history and a specialist streak separate from Today’s 6.
Sliding Puzzle · classic 15 Puzzle planning
Restore numbered tiles through one empty space with line-slide touch controls, deterministic solvable scrambles and an exact optimal benchmark on 3×3 boards.
15 Puzzle & Sliding Puzzle
Easy 3×3, classic 4×4 and Challenge 5×5 with seeded boards, multi-tile line slides, Undo, Pause, autosave and local bests.
V0.115 · DAILY SLIDINGDaily Sliding Puzzle
One date-stable board with local history and a specialist streak separate from Today’s 6.
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 · one-to-one camping logic
Use tree adjacency, row and column counts and the no-touch rule on unique 6×6, 8×8 and 10×10 boards.
Tents & Trees Puzzle
60 project-generated source boards independently checked for exactly one solution, with eight symmetry transforms, Tent/Grass marking, Undo/Redo, Check, Hint and Auto Grass.
V0.122 · DAILY TENTSDaily Tents & Trees
One date-stable verified board with autosave, local history and a specialist streak separate from Today’s 6.
Nurikabe · Islands & Walls
A pure deduction grid where exact islands, Sea connectivity and the no-2×2 rule constrain one another.
Shikaku · rectangle partition logic
Factor clue areas, eliminate blocked rectangle shapes and cover the full grid on independently unique 6×6, 8×8 and 10×10 boards.
Thermometers · straight & curved fill logic
Use bulb-to-tip continuity, row/column saturation and live fill-level ranges on independently unique 6×6, 8×8 and 10×10 boards.
Number Path · sequential path logic
Connect every number through one orthogonal path while using live gap, parity and forced-candidate reasoning on independently unique 6×6, 8×8 and 10×10 boards.
Pipes · network rotation logic
Rotate fixed pipe shapes into one leak-free connected network while live orientation domains, locks and powered-flow feedback expose forced deductions.
Fillomino · number-region growth
Build exact-size connected regions while tracking capacity, low-candidate cells and forced growth.
Maze · perfect-labyrinth navigation
Choose a verified perfect maze and track shortest-route efficiency, backtracks, dead-end entries and junction visits.
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.
Music Reading · Note Reading
Read real staff positions across treble and bass clefs, then answer on a full virtual piano with local weak-note feedback.
Note Reading
Treble, bass and grand-staff drills with ledger lines, accidentals, key signatures, response-time tracking and browser-local weak-note focus.
Practice →GUIDENote Reading Trainer
Learn staff-position, ledger-line and key-signature reading workflows before drilling them at speed.
Learn →DAILY MUSICDaily Note Reading
One date-stable local reading session with a separate specialist history and streak.
Play Daily →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
Compare generated connected voxel sculptures under exact proper cube rotations, distinguish mirror images from the same object, and use response-time plus error-type feedback to train spatial transformation rather than guess from silhouettes.
Object Tracking · dynamic visual attention
Track several identical moving targets through deterministic collision-screened paths, compare fixed and Adaptive speed, and review target hits, false picks and Clean best speed.
Task Switching · cognitive flexibility
V0.138 adds deterministic rule-shift blocks with repeat/switch accuracy, median timing, conflict timing and a separate date-stable Daily.
Go / No-Go · response inhibition
V0.139 adds deterministic inhibition blocks with rare No-Go trials, commission/omission feedback, reaction-time consistency, Training Highlight and Adaptive pace.
Digit Span · forward and backward recall
V0.140 adds deterministic numerical serial-recall ladders with two attempts per span, touch keypad input, transparent timing, Chunk Cue assistance and Clean bests.
Flanker · selective attention under distractor conflict
V0.141 adds deterministic center-target trials with congruent, incongruent and neutral flankers, Clean/Assisted separation, condition metrics and a date-stable specialist Daily.
Visual Search · static target detection
Search controlled 3×3 through 7×7 fields for one exact target or conclude Absent, with set-size timing and Clean/Assisted separation.
Change Detection · Visual Working Memory
Remember a brief array, hold it through a delay, then decide Same or Different with transparent set-size feedback.
Practice Change Detection Read the guide Daily Change Detection
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 →Japanese Vocabulary Mastery
Fifteen 20-word themes with first-attempt meaning, production and reverse retrieval.
Kanji Mastery
Complete 113 decks across the frozen 2,211-character bank with meaning, reading and reverse retrieval.
Explore Kanji Mastery →2048 strategy
Prefer decision training to another full run? Compare every legal swipe, then transfer the five board-management principles back to Classic or Daily 2048.
Chess tactics
Prefer a short pattern-recognition session to a full game? Open the dedicated tactics path while keeping classic Chess one click away.
Nonogram Logic Coach
Explainable line deductions from the existing frozen 120-grid Nonogram bank.
Practice five deduction techniques
Train Study, Drill 10, Mastery 14, Mixed Mastery, Weak Review and Sprint 60 without replacing the classic full-board game.
Open Coach →EXPLAINABLE DEDUCTIONLearn why a cell is forced
Follow the legal-placement proof behind Full Fit, Overlap, anchored runs, X splits and completed runs.
Read guide →FreeCell Strategy Lab
Explore numbered deals by opening complexity, inspect every distinct legal choice and practice the decisions that actually cost workspace.