My Sudoku

Medium Used from medium puzzles up.

Hidden Triple

Three digits, three cells

Three digits that can only go in the same three cells of a unit will fill those cells, one each.

Those cells are then taken: remove every other candidate from them.

What to look for

Find three digits confined to the same three cells of one unit.

Example

5894351382671625824595778345949372524596291914598951826473683794512124271356986973582594291689129126958162359573789249249249681735 112233445566778899
Hidden Triple: in box 2, {2,4,9} fit only in R2C4, R3C4, R3C6; remove every other candidate from those cells.
  • The cells the technique relies on
  • Cells where it removes candidates, struck out in red

Practise it

In the app, Learn › Hidden Triple sets exercises on real positions, then a full puzzle that needs this technique and nothing harder.

Practise in your browser