Shikaku
Turn an open grid into a satisfying patchwork of perfectly sized rectangles.
How to play Shikaku
- Divide the whole grid into rectangles without overlaps or gaps.
- Each rectangle must contain exactly one number.
- That number is the rectangle’s area: a 6 can be a 1 × 6, 2 × 3, 3 × 2 or 6 × 1 rectangle.
Make your move
Tap one corner, then the opposite corner to draw a rectangle. You can also drag between corners. Selecting an existing region twice removes it.
Find your level
Start with Beginner or Easy to learn the rules, choose Medium for a steady challenge, or explore Hard and Expert when available. Ratings use each game’s solver effort and clue structure. Some size and difficulty combinations are unavailable until they can be generated reliably.
Every new puzzle is generated on your device and checked for a unique solution. You can pause, get a hint, or come back later. Your progress stays in this browser.
A little more to know
Can I draw squares?+
Yes. A square is a rectangle. A clue of 4 could describe a 2 × 2 square or a 1 × 4 rectangle.
Can rectangles contain two numbers?+
No. Every rectangle must contain exactly one clue, and its area must match that clue.
Can I share this exact puzzle?+
Yes. Use Share to copy a link with the puzzle’s ID. The same version, size, difficulty and seed recreate the same starting puzzle. Your answers are not shared.
Is my progress saved?+
Your puzzle, timer, notes and undo history save automatically in this browser when storage is available. Private browsing, clearing website data or changing devices may remove access to your save.