Four digits. A small Sudoku challenge.
Select an empty cell, then choose a digit. Every row, column and 2x2 box must contain 1 to 4. Each generated puzzle has one solution. Wrong entries add a mistake; correct entries remain.
Pause at any time and continue your saved game later. Your game state and personal best stay on your device. Erase them from the in-game privacy screen. No ads, purchases, accounts, Internet permission or analytics SDKs. The interface follows your system language in English or Chinese.
Four digits. A small Sudoku challenge.