Kakurasu
Shade cells so each row adds up to its clue using the column numbers, and each column adds up using the row numbers. Thirty puzzles from 4x4 to 8x8, each with one answer.
Play nowHow to play
Controls
TapDrag- Tap a cell to shade it, tap again for a dot (empty), again to clear.
- Drag to paint.
- Rows count column numbers; columns count row numbers.
About the game
Kakurasu is a tidy little adding puzzle. Every column has a number along the top, 1 to n, and every row has one down the side. Shade cells in a row and the row's total is the sum of their column numbers, which has to match the clue on the right. The same goes for columns, using the row numbers and the clues along the bottom.
The twist is the live weights. Touch any cell and its row and column light up, the shaded cells show the value they add, and a running total sits under each clue, turning green when it hits the target and red if you go over. Thirty puzzles grow from 4x4 to 8x8. Each has exactly one answer and can be solved by logic, though later ones need you to test a choice and see it break.
Free to play in your browser. No download, no sign-up. Works on phones, tablets and computers. Your progress is saved on this device.