Learn mode

Master the strategies

Bite-size lessons that teach you to *see* the patterns. Each one ends with an interactive try-it-yourself moment.

Beginner

0/4 done

Rules of Sudoku

Learn the goal and the three golden rules.

Scanning the Board

How to look at the grid systematically.

When a cell has only one possible value.

When a digit can only fit in one cell of a unit.

Intermediate

0/3 done

Candidate Elimination

Use pencil notes to track possibilities.

Two cells, two candidates — eliminate elsewhere.

Box-Line Reduction

When a digit in a box is locked to one row/column.

Advanced

0/2 done

A four-corner pattern that eliminates candidates.

X-Wing's three-row cousin.