Shikaku
Draw a rectangle around each number so its area matches. Exactly one way.
Three new boards every day — Easy, Medium, Expert. Each has exactly one solution, checked by a solver before you see it.
One number, one rectangle
What the app does, and what is checked before a board reaches you.
Three boards every day
Easy 5×5, Medium 8×8 and Expert 12×12, identical worldwide. The day counts towards your streak only once you solve all three.
No guessing on easy to hard
A solver proves every board has exactly one solution, and on the first three bands it reaches that solution without ever guessing.
A half-drawn box costs nothing
Leave an unfinished rectangle on the board as a note to yourself. There is no timer and no penalty for thinking out loud.
Practice, archive, 5×5 to 14×14
Practice any of five bands from 5×5 to 14×14, and replay past days from the archive. Pinch-zoom keeps the big boards playable on a phone.
Offline, private, five languages
No account, no sign-up, everything on your device. English, German, Arabic, Persian and Kurdish (Sorani), with RTL and native numerals.
Free, with one optional unlock
Extra hints come from an opt-in rewarded video, one short ad may follow a solve, and €1.99 removes ads. No banner ever sits on the board.
See it in play
The daily hub, a board mid-solve, the same board in Kurdish Sorani, and your stats.
Ready to try Shikaku?
Draw a rectangle around each number so its area matches. Exactly one way.
Scan to download