Shikaku Days

About Shikaku Days

Shikaku Days is a free web game devoted to Shikaku, the rectangle-dividing logic puzzle first published by the Japanese puzzle company Nikoli. Its makers describe it as a tribute to the puzzle, built for a daily routine.

A new puzzle is generated at midnight, the same for every player around the world. The page shows the date, a timer that starts when you tap to begin, and counters for moves and hints.

You drag across cells to draw a rectangle; each one must contain exactly one number, and that number must equal its area. Every cell must be covered, with no overlaps. Undo, clear and a hint button help when you get stuck, though hints are counted.

Times go on a global daily leaderboard, and players can join one of five teams to compete together. It suits anyone who wants a short, number-light logic puzzle each day with a bit of friendly competition.

How to play Shikaku Days

1. Open Shikaku Days and tap to start today's puzzle and its timer.
2. Drag across the grid to draw a rectangle around a number.
3. Make sure the rectangle's area equals its number and that it holds no other number.
4. Use undo or clear to fix mistakes, and a hint only if you are stuck.
5. Cover every cell to finish and see your place on the daily leaderboard.

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