Play Shikaku Online

This page is built so both new and experienced players can enjoy free Shikaku puzzles without installing anything. Smaller boards are fast and approachable, while larger grids give you more clue interactions, longer scans, and more satisfying solves.

You can switch puzzle sizes in one click and use Practice mode as a warm-up area, a low-pressure training space, or a daily logic habit. The goal is to make it easy to start with simple boards and gradually move into harder Shikaku puzzle sessions at your own pace.

Shikaku is a rectangle partition puzzle played on a grid with numbered cells. Each number tells you the area of one rectangle, and every rectangle must contain exactly one clue. When the full board is divided into valid rectangles, the puzzle is solved.

What makes Shikaku appealing is how clear the rules are. There is no hidden trick and no need for random guessing. You study the shape of the board, test likely rectangles, and use each confirmed placement to narrow the possibilities around it.

Pick a board size, load a fresh puzzle, and start when you are ready. The Practice board is designed for quick entry: you can begin with a compact grid for fast rounds or choose a bigger puzzle if you want a more involved solving session.

Once the puzzle starts, drag to mark a rectangle that contains exactly one number and matches that clue's area. As you fill the board, the timer keeps the round readable without pulling attention away from the puzzle itself.

Start by looking for clue cells that have only a few realistic rectangle shapes. Small values often force quick decisions, and those early placements make the rest of the grid easier to read. If a clue seems too flexible, leave it for a moment and return after nearby rectangles are confirmed.

It also helps to think in terms of coverage and pressure. Ask which cells must belong to a certain clue, which spaces are becoming crowded, and which large rectangles are losing room to fit. Good Shikaku solving usually comes from patient elimination rather than speed alone.