Sumoku — Kakuro Cross

Pure-logic number puzzles you can always solve without guessing. New daily challenge, five difficulties, helpful hints, and a calm, modern board.

Sumoku is Kakuro — the cross-sums number puzzle — done right.

Fill the white cells with digits 1–9 so every run adds up to its clue, with no digit repeated in a run. Every puzzle is guaranteed to have a single solution reachable by pure logic — you never have to guess.

• Five difficulties, graded by the solving techniques required (not by size) • A fresh Daily Challenge every day, with streaks and a month calendar • Smart, progressive hints when you're stuck • Pencil marks, auto-candidates, undo/redo, conflict highlighting • Multiple puzzles in progress at once — everything auto-saves • Achievements, stats, and five color themes • Fully offline. English & Turkish. Left-handed mode, color-blind cues, screen-reader support.

No accounts, no subscriptions, no paywalls. Optional rewarded ads only when you ask for extra hints.