Shikaku Days
Rate itOne Shikaku a day for everyone: split the grid into rectangles that each hold one number equal to their area.
on shikakudays.com
Shikaku Days serves one Shikaku puzzle a day, the same for every player. You drag across the grid to draw rectangles so that each holds exactly one number equal to its area, with no gaps or overlaps. A timer, move and hint counts, a team race and an archive of past days come with it.
About Shikaku Days
Shikaku Days is a free web game built around Shikaku, the rectangle-dividing logic puzzle that came out of the Japanese puzzle publisher Nikoli. Its About page calls it a tribute to the puzzle, made for a daily habit.
A new grid is generated at midnight UTC and every player in the world gets the same one. The page opens on today's date with a large play button over the board, and the timer only starts once you press it. On 8 November 2026 the grid was 6x6, with nine clues from 1 to 8.
You drag from one cell to another to draw a rectangle. Each rectangle has to hold exactly one number, and that number has to equal its area. Every cell must end up covered. Tapping a rectangle removes it. Undo and Clear fix mistakes, and the Hint button helps when you are stuck, with a ten second wait between hints. The page counts your moves and hints beside the clock.
The leaderboard is a race between five animal teams. Each day's champion is the team with the best average time, and a My History tab keeps your own results. A calendar button opens the archive, where any earlier day can be played.
The grids are small, so a solve takes a few minutes at most. That suits a player who wants a short spatial puzzle with breakfast, or someone meeting Shikaku for the first time. There are no ads and no sign-up before play.
How to play Shikaku Days
- Open Shikaku Days and press the play button to show today's grid and start the timer.
- Drag from one cell to another to draw a rectangle around a single number.
- Check that the rectangle's area matches its number. A 6 needs six cells, as 2x3 or 1x6.
- Tap a rectangle to remove it, or use Undo and Clear. Ask for a hint only when stuck.
- Keep going until every cell is covered, then see how your team did on the leaderboard.
Screenshots
Tips
- Large numbers near walls usually have only one or two possible shapes, so place them first.
- A 1 is always a single cell, and a prime number must be a single row or column.
- Mark cells that only one number can reach before trying the open areas.
Questions
Is the puzzle the same for everyone?
Yes. A new grid is generated at midnight UTC and every player gets the same one.
Is there a leaderboard?
Yes. Players join one of five teams, and each day the team with the best average time wins. A My History tab shows your own results.
Can I play earlier days?
Yes. The calendar button opens an archive with a puzzle for every past day.
Does it cost anything?
No. It is free in the browser, with no ads and no account needed.
Ratings and reviews
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