Weight Grid
Drop iron weights into the grid until every row and column balances its brass plate. Locked plates open as you finish the lines beside them.
Play nowHow to play
Controls
TapKeyboard←→↑↓ Space- Tap a cell to drop a weight, tap again for a cross.
- A weight counts its column number in its row and its row number in its column.
- Keys: arrows and Space.
About the game
Weight Grid is a logic puzzle also known as Kakurasu. Drop iron weights into the grid so every row and column balances its brass plate. A weight counts its column number toward its row and its row number toward its column, so a single cell can settle two sums at once. Some plates start locked behind a question mark and open the moment you finish a line right beside them, which turns each solved line into a key.
Thirty-six boards grow from four by four to nine by nine, with more locked plates as you go. Every board has exactly one answer that you can reach by reasoning alone. Overfull lines glow red at once, undo is unlimited, and the hint names the line that proves its move.
Free to play in your browser. No download, no sign-up. Works on phones, tablets and computers. Your progress is saved on this device.