About
Cross Sums is a math puzzle game where you cross out numbers so the remaining numbers in every row and column match their target sums.
How to play
- Tap a number to cycle it between crossed out, kept, and normal.
- The targets beside the board show the sum each row must reach.
- The targets below the board show the sum each column must reach.
- Tap a completed row or column target to mark the remaining numbers in that line as kept.
- Right-click or long-press a target sum to clear all marks in that row or column.
- The board is solved when all row and column sums match their targets.
Tips
- Start with rows or columns that have only one obvious way to reach their target.
- Cross Sums puzzles are solved by deduction and not by guessing. You never have to guess to solve this puzzle. Making correct marks will lead you to the next clue.
Keyboard shortcuts
- Undo
- CtrlZ
- Move cursor
- ↑ ↓ ← →
- Fast move cursor
- Shift↑ ↓ ← →
- Mark cell
- Space
- Mark previous state
- Z/ShiftSpace
- Mark current row
- R
- Clear current row
- ShiftR
- Mark current column
- C
- Clear current column
- ShiftC