a pongsixtyfour game
Crossums
fill every cell so its row and column add up. sudoku's cousin, with a rule all its own.
- 200 puzzles in volume I, every one hand-played
- no ads, no account, no streak guilt
- one purchase. iPhone and Android.
try the first one
every row and column has a target sum. fill the blanks with digits 1 to 9 until they all add up. a satisfied sum turns green.
repeats are allowed and there's no uniqueness rule to fight: any arrangement that hits every sum is correct. this is the game's real puzzle 001.
volume I, puzzle 001
tap a cell, then a digit
what's in the book
Foundations included
200 puzzles across five chapters, from 3×3 up to 5×5. the difficulty climbs slowly, so you learn the moves by playing them.
Regions in-app purchase
another 200. bordered groups of cells get their own sums, on top of every row and column. same rules, a new shape to reason about.
Crossings in-app purchase
another 200. regions overlap, so one cell can count toward two sums at once. same difficulty, a new twist to reason about.
how it looks in your hand
Crossums
no ads, no tracking, no account. anonymous crash and error reports, never linked to you. read the privacy policy