4×4 数独

4×4 Sudoku, often called Mini Sudoku, fills a grid of four 2×2 boxes with the digits 1 to 4. With only sixteen cells it is the gentlest possible introduction to Sudoku logic — short enough for a child or a complete beginner to finish in a minute, while still teaching the one rule that matters: no digit repeats in any row, column, or box.

It is the ideal place to learn the naked single — a cell where only one digit can fit — before stepping up to 6×6 and the standard 9×9 grid.

规则 · 学习