Kakuro

Kakuro (also known as Cross Sums) is a number-logic puzzle: use the sum clues in the black cells to fill the white cells with digits 1–9. A digit cannot repeat within a run. Just addition, no guessing.

- Five rule sets: Classic Kakuro, Cross Products (clues are products), Jigsaw Kakuro (no repeats inside bold regions), Zero Kakuro (digit 0 allowed) and Hexa Kakuro (16 digits, A–G = 10–16)
- Four difficulties per rule set (Easy, Medium, Hard, Expert) with 400 puzzles each: 8,000 puzzles in total
- Board sizes: 7×7 / 9×9 / 11×11 / 12×12 for Classic, Jigsaw and Zero; 7×7 / 8×8 / 9×9 / 9×9 for Cross Products; 8×8 / 10×10 / 12×12 / 12×12 for Hexa
- Every puzzle is verified by a solver to have a unique solution reachable by logic alone
- The combination bar shows which digit sets fit the selected run, so you can focus on deduction instead of arithmetic.
- Memo mode, undo / redo and hints when you get stuck (3 per puzzle)
- Cell-first or number-first input, switchable from the play screen; mistakes shown in red; game over after 3 mistakes (can be turned off)
- Hexa digits 10–16 can be shown as A–G or as plain numbers; pinch to zoom the large boards
- Progress is saved automatically so you can continue any time
- Play History shows cleared counts, average clear time and total play time per rule set and difficulty
- Four gentle themes (Cozy, Dark Night, Sakura, Mint), playable in portrait or landscape

Recent changes:
- Add Play Games services (Achievements & Leaderboards) (1.1.0)