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Weekly Shikaku

A hard 15×15 Shikaku that stays the same all week. Perfect for a long weekend session or a shared office challenge. A new puzzle appears every Monday (ISO week).

Weekly challenge Next in

0 rectangles · Drag to draw · Tap a rectangle to erase · Ctrl+Z undo · H hint

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Same puzzle for everyone

The grid is generated from the date, so every player worldwide gets the identical 15×15 puzzle and can compare times fairly.

Take your time

Leave and come back whenever you like — your rectangles and timer are saved automatically in your browser.

More challenges

Daily Shikaku · Monthly Shikaku · or pick any size and level.