How to Play Shakashaka
Place right triangles in white cells so that all remaining white space forms rectangles. Numbers in black cells tell you how many adjacent white cells contain triangles.
Try it now — Easy 7x7 →The Rules
- Place right triangles (corner-to-corner half-cells) in some white cells
- All remaining white space not covered by triangles must form complete rectangles
- Numbers on black cells show how many adjacent white cells contain triangles
- Each white cell is either empty or holds exactly one right triangle
Available in 3 sizes (5x5, 7x7, 10x10) and 3 difficulty levels (easy, normal, hard).
See It in Action
Place right triangles in white cells so all remaining white space forms rectangles
How to Play
- Use black cell numbers to determine which adjacent white cells must have triangles
- Check L-shaped or irregular white regions — they always require triangles to become rectangular
- Each triangle has four orientations (top-right, top-left, bottom-right, bottom-left) — choose the one that creates rectangular space
- Verify all white regions are rectangles and all black cell number constraints are satisfied
Pro Tips
A black "0" means none of its adjacent white cells have triangles — mark those cells as empty immediately
White L-shaped regions, T-shapes, and other non-rectangles always need at least one triangle to correct their shape
Work from the borders inward — corner and edge cells have fewer valid triangle orientations
Frequently Asked Questions
What is Shakashaka?
Shakashaka is a logic puzzle where you place right triangles in white cells. When filled, all remaining white space (not covered by triangles) must form rectangles. Numbers on black cells tell you how many of their adjacent cells contain triangles.
Choose Your Challenge
Start with easy to learn the rules, then progress to harder difficulties.