Sudoku technique · First needed at: Hard
Hidden triple
Three numbers are confined to these three cells — remove every other option from them.
An example from a real puzzle
- Where the deduction happens
- The cells that make the pattern
- Candidates it removes
How to spot it
- In one group, find three numbers whose possible places all fall within the same three cells.
- Clear every other candidate from those three cells.
Why it works
Three numbers confined to three cells fill them, so nothing else can go there.
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