Quarters: the rectangle-dividing logic puzzle
Cut the grid into rectangles so that each one holds exactly one number, and that number equals its area. No math beyond counting, all logic.
How to play Quarters
- 1
Draw
Drag across the grid to draw a rectangle.
- 2
One number each
Every rectangle must contain exactly one number.
- 3
Match the area
The number of cells must equal that number.
- 4
Fill it all
Cover the whole grid with no gaps or overlaps. Tap a rectangle to remove it.
Which rectangles can a number make?
| Number | Possible rectangles | Why it helps |
|---|---|---|
| 1 | 1×1 | Always a single cell: draw it straight away |
| 4 | 1×4, 2×2, 4×1 | Three shapes, often one fits |
| 5, 7 (primes) | 1×5, 5×1 · 1×7, 7×1 | Only straight lines: at most two orientations |
| 6 | 1×6, 2×3, 3×2, 6×1 | Four shapes: wait for neighbours to decide |
Solving techniques
- 1
Start with the certain ones
1s, and numbers squeezed into a corner or between other numbers, often have only one shape that fits.
- 2
Look at empty cells
If a cell can only be reached by one number's rectangle, it belongs to that number. This often breaks a hard puzzle open.
- 3
Use primes
A 5 or a 7 can only be a straight line, so there are at most two orientations to check.
- 4
Re-scan after every move
Each rectangle removes options for its neighbours. Look around it for numbers that just became forced.
How the levels grow
5×5
first grids, several hints
10×10
top grids, fewer hints
1
solution per puzzle, no guessing
Grids grow through 6×6, 7×7 and 8×8 to 9×9 and 10×10. This type of puzzle comes from Japan, where puzzle magazines made it popular; in English it is known as shikaku or “divide by squares”. In Brainura it is called Quarters.
Frequently asked questions
What are the rules of shikaku?
Divide the grid into rectangles so that each rectangle contains exactly one number and its area equals that number. Every cell belongs to exactly one rectangle.
Do I need to guess?
No. Every puzzle in Brainura has a unique solution that can be found by logic alone.
Is Quarters free?
Quarters is a Premium game. New players get all Premium games free for the first 7 days, no card needed.
Try next
Play Quarters in Brainura
One of 26 short brain games with levels that adapt as you improve. Five minutes a day, no ads, no account.
Free to install · no ads · no account needed