Useful skills, built through real games.
Choose a skill you actually want to improve, then practice it inside a replayable game loop. Progress stays on this device; there is no account, classroom dashboard or hidden proficiency score.
Languages
Start with a foundational writing system, not a thin trivia page.
Japanese Kanji
2,211 source-backed study kanji with typed Meaning and Reading recall, Reverse, Sprint, Due + Weak Review, Daily Kanji and a searchable reference bank.
Practice Kanji →JAPANESE · VOCABULARYJapanese Vocabulary
300 beginner words across 15 themes with Meaning, Reading, Reverse, Sprint, Due + Weak Review, Daily Words and a searchable Word Bank.
Practice Words →JAPANESE · FOUNDATIONJapanese Kana — Hiragana & Katakana
Recall, reverse recognition, Sprint, Weak Kana, Daily Kana and a full 208-entry script reference.
Learn Kana →VOCABULARYJapanese Vocabulary Quiz
Mix meaning, typed reading and reverse retrieval with local due/weak review.
Start Vocabulary →WORD GAMEJapanese Word Game
Retrieve useful beginner words from meaning, reading and reverse prompts, then cycle misses through local review.
Play Word Game →KANJIKanji Quiz
Type meanings and readings across N5–N1 study bands with source-backed data and local review.
Start Kanji Quiz →DAILY KANJIDaily Kanji
Play one date-stable 12-prompt mix balanced across five study bands and three retrieval directions.
Play Daily →Digital skills
Practice a skill that transfers directly to school, coding, writing and everyday computer work.
Typing Test
Timed and word-count tests with WPM, raw speed, accuracy, 18 structured lessons, Custom Text, Daily Typing, Focus Lab and browser-local Weak Keys.
Take a Typing Test →SPEED + ACCURACYTyping Speed Test
Choose 15, 30, 60 or 120 seconds, or fixed 10/25/50/100-word targets, then use problem-key feedback for targeted follow-up practice.
Test WPM →V0.144 · KEYBOARDINGTyping Lessons
18 unlocked Foundation, Reach and Fluency lessons with local accuracy mastery and direct links into Focus Lab.
Learn the keyboard →DAILY SKILLDaily Typing
One date-stable 60-second target and a local specialist streak, separate from Today’s 6.
Play Daily →Math, world knowledge & reasoning
Existing games already teach useful skills when the mechanic and feedback are honest.
Mental Math
Arithmetic rounds, speed play, Adaptive Ladder, decimals, roots, negatives and order of operations.
Practice Math →WORLDGeography
Learn countries, locations, capitals and flags across the full 195-country core.
Explore Geography →KNOWLEDGETrivia + Review
420 explanations-backed questions with a local spaced-review queue for misses.
Practice Knowledge →Practice data is not a diagnosis.
Scores, streaks, Weak Kana, Weak Words, review stages and personal bests describe what happened in these games on this device. They are not IQ estimates, JLPT scores, classroom grades or population percentiles. The Japanese games teach scripts and beginner vocabulary. The 300-word bank is not an official JLPT vocabulary list and does not certify Japanese proficiency.
Multiplication fluency
Practice 1–12 tables with first-attempt accuracy and real Weak Facts.
Chemistry · Periodic Table
Turn the 118-element table into active recall instead of a poster you only scan.
Name All Elements
Produce element names or symbols in any order and rebuild the blank table across 1–20, 1–54 or all 118 elements.
Recall →CHEMISTRYPeriodic Table
Learn element positions, then recall names, symbols and atomic numbers across Foundations, Core and Full pools.
Practice →DAILY 10Daily Periodic Table
A date-stable ten-question chemistry session with browser-local history and streaks outside Today’s 6.
Play →Communication · Morse Code
Train International Morse as a sound, recall and timing skill with a frozen local character map and browser-generated audio.
Morse Code / CW Trainer
Reference, audio copy, visual encoding, five-character groups and press-duration keying across four verified character pools.
Practice →GUIDEMorse Code Practice Guide
Understand sound-first learning, dot-dash timing, Farnsworth-style spacing, Copy 5 and real press-duration keying.
Learn →DAILY 10Daily Morse Code
A date-stable ten-question communication-skill session with local autosave, history and a streak outside Today’s 6.
Play →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 · distributed attention practice
Hold several moving identities at once while visually identical distractors cross the same field. Speed presets and Adaptive mode change temporal load without changing verified path geometry.
Rule switching and response control
Practice Task Switching with exact cue-derived answers, transparent switch cost and conflict cost, plus Clean and Assisted histories.
Response inhibition and action control
Practice Go / No-Go with exact shape/color rules, commissions versus omissions, Clean and Assisted histories, and transparent Adaptive pace.
Ordered recall and working memory
Practice Digit Span with one-at-a-time presentation, separate Forward and Backward modes, exact recall scoring, Clean and Assisted histories, and transparent span/timing metrics.
Selective attention and distractor conflict
Practice the Flanker center-target rule with congruent, incongruent and neutral surrounding symbols, transparent speed/accuracy tradeoffs, Target Spotlight assistance and Clean bests.
Learn systematic visual search
Practice target confirmation, Absent decisions and repeatable scan patterns while set size and distractor similarity stay explicit.
Sudoku technique reasoning
Move from Singles and locked candidates through pairs, triples, X-Wing, Swordfish and Skyscraper using candidate states derived from the same verified 160-puzzle Sudoku source bank. Clean mastery stays separate from Hint or Reveal assisted solves.
Learn Change Detection
Practice location-based encoding, systematic probe comparison, Same/Change error interpretation and Clean versus Study Boost Assisted runs.
Practice Change Detection → Open 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
Turn the frozen 300-word beginner bank into 15 complete 20-word mastery units with typed production and Weak Word prioritization.
Japanese Kanji Mastery
Work through all 2,211 source-backed study kanji in 113 bounded decks with typed meaning and reading recall, mixed mastery and Weak Kanji prioritization.
2048 move-choice training
Turn board-management advice into first-attempt decisions with five explainable strategy tracks and an editable Board Lab.
Chess Tactical Vision
Build a repeatable scan for checks, forks and concrete material wins with first-attempt scoring and local Weak Tactics review.
Nonogram deduction practice
Learn why a row or column move is forced before returning to a full board.
Explainable Nonogram deductions
Study Full Fit, Overlap, Anchored Run, Cross Split and Completed Run with first-attempt mastery and real Weak Deductions review.
Start Logic Coach →GUIDEHow forced cells are proven
See how legal line placements, visible Fill/X marks and balanced mixed mastery create a transparent training contract.
Read the guide →FreeCell Strategy Lab
Learn why a move protects workspace, mobility, ordered runs or safe foundation access instead of relying on an opaque hint.