Cuneus · Free in your browser
Shakashaka: Cuneus
Shakashaka: triangles that leave only rectangles
The rules
- In any white cell, place a black triangle filling one corner half — or leave the cell empty.
- A number on a black cell counts the triangles in the cells directly beside it.
- Every white area left over is a rectangle — upright, or turned by 45° like a diamond.
How to play here
Tap near a corner of a white cell for the triangle in that corner, in the middle to mark the cell empty; the same tap again clears it. Drag to repeat the mark.
Three ways to play
Campaign
Chapters that start gently and bring in one new idea at a time.
Daily puzzle
A new board every day, the same for everyone. Solve every one in a month and that month's trophy is yours.
Endless
Keep going as long as you like, in Easy, Medium, Hard and Expert.
Common questions
Is Cuneus free?
Yes. You can play here without paying and without an account. Ads keep the lights on.
Where is my progress saved?
In this browser, on this device. If you clear the site data, your progress goes with it. A free Solvarium account keeps it safe.
Does it work on a phone or tablet?
Yes. It runs in any current browser on phones, tablets and computers, and the board resizes to fit the screen.
Does every puzzle really have one solution?
Yes. Every board goes through a solver before it ships, and anything with more than one solution is thrown out.