A grid-based logic puzzle
Color each cell black or white… and give your brain a workout.
Get Some Puzzles
Settings
The settings page tunes how the game checks your work and asks for help.
Language: choose the app's display language (English, French or Spanish).
Validation: choose whether the grid is checked manually (you tap a button) or automatically (as soon as it is fully filled).
Live check: how errors are surfaced while you play — show every wrong cell, just an error count, or wait until the grid is complete.
Show rating: whether the rating screen appears between puzzles so you can rate what you just played on a five-level scale (very negative → very positive).
Hint type: how the hint button helps — by pointing at a cell you can deduce ("Deducible cell"), or by adding a fresh constraint that simplifies the puzzle ("Add constraint"). See the Hints section above for details.
Idle timeout: when no input arrives for the chosen delay (or the app loses focus), the timer auto-pauses so it does not keep running while you are away.
Player level (0-100): nudges the puzzles you are offered toward your reasoning speed. Higher means harder.
Auto level: when on, your level is updated automatically from your completion times. Turn it off to set the level by hand.
Replay onboarding: restart the new-player onboarding sequence from phase 0 — useful if you want to revisit the rule-introduction dialogs.
Clear stats: wipe the locally stored per-puzzle stats. The action is irreversible and asks for confirmation.