Hidden Triplet Walkthrough

A Hidden Triplet is three digits confined to the same three cells of a unit. Those cells must contain those digits, so every other candidate can be removed from them.

Sudoku board with pencil-mark candidates before applying the Hidden Triplet technique — Before — candidates pencilled in. There is a Hidden Triplet in Column 2.

There is a Hidden Triplet in Column 2. Applying the Hidden Triplet eliminates 7 candidates (struck out in red below; any solved cells shown in green).

The same Sudoku board after the Hidden Triplet technique eliminates 7 candidates — After applying the Hidden Triplet.

Learn the Hidden Triplet technique →Practice it on a real puzzle →