CrossSum is a cozy cross-sum puzzle. Circle the cells that belong — get every row and every column to match its total. No clutter, no timers, just numbers that click into place.
How it works
CrossSum plays like a cross between Kakuro and a logic puzzle — every cell either belongs to the solution or it doesn't.
Every row and column has a target number above and to the left of the grid.
Circle the digits that belong, or cross out the ones that don't — you decide the mode.
Each heading shows a live running total as you circle, so you always know how close you are.
Get every row and column to match exactly, and the level clears — three hearts, no pressure.
Features
Every puzzle is generated fresh and verified to have exactly one logical solution — never a guess.
Grids grow from 3×3 to 6×6 as you climb — a fresh, uniquely-solvable puzzle every time.
A wrong tap costs a heart, not the level. Miss all three and you simply try again.
Two free hints to start, with more available any time you need a nudge.
Close the app mid-puzzle and come back to the exact same board, hearts and all.
A light, clutter-free board with soft grid lines — nothing fighting for your attention.
Every generated puzzle is checked to have one unique answer before it ever reaches you.
CrossSum is free to play, with optional extras if you want them.