One clue per rectangle
Every region you draw must contain exactly one number clue.
Fill the grid with rectangles so each one contains exactly one clue number and covers the matching area. Play daily puzzles, pick a level, or create your own board.
Shikaku looks simple, but every number controls a precise area. The best solves come from narrowing possible rectangle shapes, spotting forced placements, and keeping the board tidy.
Every region you draw must contain exactly one number clue.
A clue of 6 means the rectangle must cover exactly six cells.
Finish when every cell belongs to one valid rectangle and no regions overlap.
Fill rectangles so each number equals the area of its rectangle.
Size 6x6 · 6 clues
Use a ready-made puzzle for a quick session, build a custom grid for someone else, and let local stats track your solves, streak, and best time in this browser.
A fresh puzzle route gives returning players a reliable starting point.
Build boards up to 20x20 and share a playable custom link.
Solved count, streak, and best time stay in browser storage.
Size 6x6 · 6 clues
Size 5x5 · 5 clues
Size 9x9 · 9 clues
Size 8x8 · 8 clues
Size 7x7 · 6 clues
Size 9x9 · 8 clues
Size 9x9 · 8 clues
Size 10x10 · 8 clues
Size 10x10 · 9 clues
Quick answers for new players, puzzle creators, and people comparing online rectangle logic games.
Yes. Built-in levels, the daily puzzle, stats, and the custom puzzle creator are available in the browser.
Each rectangle must contain one number, and the rectangle area must equal that number.
Yes. Open Create, design a custom board, then share a playable link.
Stats are stored locally in this browser, so they stay on the current device and browser profile.