Pocket Sudoku

Fill each row, column and 2×2 box with 1–4 exactly once. Select an empty cell, then a number.

One player · Puzzle

How to play?

Fill each row, column and 2×2 box with 1–4 exactly once. Select an empty cell, then a number.

Playable variations: 26

30 core games × 26 variations = 780 challenges, not 780 distinct games.