Guides / 3 min read
How to play Shikaku: rules, rectangles and your first puzzle
Learn the rules of Shikaku, work through a small rectangle puzzle, and discover how to draw, correct and complete your first board in Sukto.
Read storySHIKAKU / iPHONE & iPAD
Sukto is a logic puzzle: divide the board into rectangles by following number clues. Core play works offline, with no ads or account required.
COMING SOON


SUKTO / iPHONE + iPAD
Divide the grid into rectangles. Each region must contain exactly one clue and as many cells as its number. Cover the board without overlapping regions.
Yes. Once installed, core play and progress work on your device without an account or connection. Downloading and updating the app require internet access.
Ordinary puzzles have no time or move limit. Optional challenges explain their own conditions before you start.
Progress is stored locally. Games and statistics do not sync between iPhone and iPad.
INSIDE SUKTO
From your first rectangle to your next challenge. A look at Sukto on iPhone and iPad.
01 / SUKTO
Numbers, rectangles and room to think. A board that takes shape with every decision.

02 / SUKTO
Explore shape, precision and deduction challenges. Each offers a different way to look at the board.

03 / SUKTO
Explore solved boards and personal best times for each size.

04 / iPAD
Enjoy Sukto’s geometry in dark mode and on the iPad screen.

05 / PRO
A preview of the Pro experience in development. Purchasing is still in preparation.

Real project screenshots. App text retains the language of the original images.
Guides / 3 min read
Learn the rules of Shikaku, work through a small rectangle puzzle, and discover how to draw, correct and complete your first board in Sukto.
Read storySukto / 3 min read
Explore Sukto’s offline Shikaku puzzles for iPhone and iPad, including local progress, pause and resume, optional challenges and sharing controls.
Read storyGuides / 3 min read
Avoid seven common Shikaku mistakes, from counting the clue twice to trapping empty cells, and learn how to revise a rectangle in Sukto.
Read story