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Umeo is a quiet sudoku. No timers chasing you. No game over. No noisy effects breaking your concentration. Just the gentle feel of placing a number, and the calm satisfaction of a board filling up. A simple sudoku, made for people who enjoy thinking. FEATURES • A calm 3D board that stays out of your way: numbers settle softly, a single ripple spreads. Each difficulty plays under its own sky — dawn, day, dusk and night • Difficulty by technique, not by blank count: 400 puzzles (4 levels x 100), classified by the solving techniques they actually require. Every puzzle is verified to have exactly one solution • Beautiful boards: given numbers are laid out in symmetric patterns • Stuck? Flip the board and glimpse the answers showing through in mirror writing — a hint unlike any other • A keepsake for every win: the finished board becomes an engraved plaque • Notes on a fixed 3x3 grid, undo/redo, optional mistake hiding • Auto-save; track your progress in the puzzle list • Fully offline, no account. Your data stays on your device • Japanese & English One quiet puzzle at the end of the day.
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