Box Brain Sudoku
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Hard · technique 13 of 18
Naked Triple
Three cells in a house hold only three digits between them.
How it works
Those three digits must fill those three cells, so remove them from the rest of the house. A cell need not hold all three.
A worked example
Naked Triple: in box 6, the cells in row 4, column 9; row 5, column 7 and row 5, column 9 can only hold 3, 6 and 7, so those digits are removed from the rest of the house.
- The area to look at
- The cells that make the pattern
- Candidates it rules out
A real position from a puzzle in the app. Small digits are the candidates the step looks at; coloured digits are already solved.
Practise it in Box Brain Sudoku
The app teaches Naked Triple on this same board, then hands you puzzles that need it. When you are stuck mid-game, a hint first points you to the right area, then names the technique and shows the move.