Best Free Shikaku Game
Divide the grid into rectangles so each one holds a single number equal to its area.
Level 1
press P to pause
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How to play
- Read a number. Each number is the area of the rectangle it belongs to - the number of cells that rectangle must cover.
- Drag a rectangle. Drag from one cell to another to draw a rectangle around a number. Click a rectangle to remove it if you change your mind.
- Fill the board. Cover every cell with rectangles that don’t overlap, each holding exactly one number equal to its area.
About Shikaku
Shikaku - also known as divide by squares - is a partition logic puzzle. The grid is dotted with numbers, and your task is to slice the whole board into rectangles so that each rectangle contains exactly one number and that number equals the rectangle’s area: its width times its height. A 6, for example, marks a rectangle of six cells - 1×6, 6×1, 2×3 or 3×2 - and you work out which shape and position fits without overlapping any other rectangle or leaving a gap. Each puzzle is generated fresh from a real partition. No signup, no download, nothing uploaded.
Frequently asked questions
Divide the entire grid into rectangles so that every rectangle contains exactly one number, and that number equals the rectangle’s area - its width multiplied by its height. Drag from one cell to another to draw each rectangle; no rectangle may overlap another and no cell may be left uncovered.
A number is the area of the rectangle it sits in - how many cells that rectangle must cover. A 6 belongs to a six-cell rectangle, which could be 1×6, 6×1, 2×3 or 3×2.
Press on one corner cell and drag to the opposite corner to draw a rectangle, then release. Drawing over existing rectangles replaces them, and clicking a single cell inside a rectangle removes it.
Yes. Each puzzle is generated from a genuine partition of the grid into rectangles, so a complete, gap-free solution always exists and can be reached by logic.
Difficulty sets the grid size: easy is 5×5, normal is 7×7 and hard is 9×9. Bigger boards hold more numbers and more rectangles to place.
Completely free, with no signup, no download and no paywall. Puzzles are generated and played entirely in your browser - nothing is uploaded.
Yes. It runs in your browser, so Shikaku works on phones and tablets as well as desktop - there is no app to install.
No. Shikaku works with no signup at all; an optional free account only exists to unlock higher usage limits.
Usually just a few seconds for a typical file - Shikaku starts working the moment you give it your input.
Your input is processed in memory and never stored, so nothing is left behind once you have your result.