Sokoban (倉庫番, "warehouse keeper") was created in 1981 by Hiroyuki Imabayashi in Japan. It is one of the most important pure-deduction puzzle games ever designed — no reaction required, no randomness, no time pressure. The only challenge is working out the correct order of moves.

On the surface it looks trivial: push boxes onto target spots. But the constraint "you can push but never pull" explodes the strategy space — one wrong push can wedge a box against a wall forever. Top-level Sokoban levels are known to be PSPACE-complete, meaning the theoretical difficulty is essentially unbounded.

MeTool Sokoban ships 20+ hand-crafted classic levels, unlimited undo, arrow-key and touch-swipe controls, Canvas rendering, pure frontend, zero ads.

Sokoban isn't just a way to kill 10 minutes. It exercises several cognitive dimensions that are rare in other games:

Lookahead: You can't just look at the current move — you must simulate "if I push this box here, can the other boxes still reach their targets?" Multi-step lookahead is a core skill shared by programmers, chess players, and strategists.

Deadlock recognition: Some pushes create unrecoverable "dead corners" — a box against a wall with no target under it. Spotting these early requires a structural view of the whole map.

Subproblem decomposition: Complex levels usually decompose as "clear the left side first, then the right." But the decomposition isn't always valid — some boxes have ordering dependencies. Learning when decomposition breaks is the key to expert-level play.

Research shows that Sokoban markedly improves spatial reasoning and planning ability in children — it's used in many countries' elementary "thinking-skills" curricula.

Zero friction: open and play — no login, no ads, no in-app purchases.

20+ curated levels: from 5×5 warm-ups (1-2 boxes) to large 10×10+ layouts (5+ boxes), a steady difficulty ramp.

Unlimited undo: every move is reversible so you can experiment freely. Restart any level from the start in one click.

All devices: arrow keys on desktop; swipe or virtual D-pad on mobile. UI adapts to screen size.

Auto-save progress: your current level position is saved after every move — reopen the page and continue right where you stopped. Starting a new level series clears the save.

Pair with: Sudoku, Numberlink, Sliding Puzzle — other deduction-first games.