The daily logic ritual
Fill the grid. Free your head.
Kaku is a calm, beautiful Shikaku puzzle for iPhone and iPad. Divide the grid into rectangles, one number each, equal to its area. Solve alone as a daily ritual, or race a friend round for round.
Free · No ads · No subscription
One rule
One number.
One rectangle.
Its area.
Divide the whole board into rectangles so that each one contains exactly one number, and that number equals how many cells it covers. That’s the entire game. No trivia, no luck, no reading required. Pure, quiet deduction.
New to it? How to play Shikaku, worked through on a real board.
Every day
The same puzzle,
the whole world.
One shared Puzzle of the Day, identical for everyone, resetting at midnight UTC. Race the global leaderboard, split by Pure and Assisted, and keep your streak alive. Miss a day and the flame resets, that’s the whole thrill.
00:00
Resets, UTC
Two
Rankings
Today’s puzzle
Leaderboard- 1 M Marta 0:14
- 2 K Kenji 0:17
- 3 L Lucía 0:19
- 4 T Tom 0:25
- 5 A Ana 0:27
- 6 D Diego 0:29
- 12 Y You 0:55
- 1 Y Yuki 0:22
- 2 E Emma 0:24
- 3 N Noah 0:26
- 4 S Sofía 0:30
- 5 L Liam 0:35
- 6 O Olivia 0:38
- 31 Y You 1:12
An example board · try the Pure / Assisted toggle
The Collection
Every daily becomes a stamp.
Solve the daily and the board you solved is pressed into your album, dated and timed. Land in the day’s fastest three, hint free, and it mints in gold, silver or bronze foil. Miss a day and the slot stays empty, forever.
A single ladder
Grows with you, 7×7 to 12×12.
No gimmicky giant blocks. Difficulty comes from the deduction required, and the board grows right alongside it. Pick a tier and you’ve picked a board.
Beginner
Free7×7
Forced singles only. The gentle way in.
Easy
Free8×8
Cell ownership enters the picture.
Medium
Free9×9
One layer of genuine search.
Hard
Pro10×10
Deeper deduction, bigger board.
Expert
Pro12×12
The full 12×12. Three searches deep.
Seven worlds
Pick a mood. The whole game re-tones.
Each theme sets the accent, the board palette and a matching Liquid Glass app icon, from calm Eucalyptus to electric Pop. Tap one and the whole page shifts with it, boards and all.
Tap a theme to try it on. Tap again to release it.
Versus
Bring a rival.
Share any puzzle as a “beat my time” link: same board, same start, just a race. Build a head-to-head rivalry that remembers every duel, or spin up a live match: everyone solves the same rounds at once, with real-time results and a rematch button.
- Challenge a friend. One tap, one link. No account needed to join.
- Rivalries. A running tally against everyone you’ve played.
- Live matches. Up to a room of players, round by round, in real time.
Rivalry
Calm by design
A quiet place to think.
Liquid Glass
Warm paper, soft charcoal, translucent surfaces. Built native for iOS 26.
No timers shouting
A quiet clock you can hide. No lives, no loss state, no ads, ever.
Haptics & sound
Every placement lands with a gentle tick. Turn it all off if you prefer silence.
iPhone & iPad
One universal app, adaptive on every screen, in seven languages.
Streaks & sync
Your solves, streaks and stamps follow you across devices over iCloud.
One-time unlock
Kaku Pro is a single purchase. No subscription. Play free for as long as you like.
Today’s puzzle
is waiting.
Free to play, forever. iPhone & iPad. Unlock Pro once for the deep boards, more hints and every theme.