Box Brain Sudoku
Learn › Greater Than Signs
Easy · technique 7 of 18
Greater Than Signs
A sign tells you which of two neighbours is bigger.
A Greater Than sudoku technique.
How it works
The smaller cell must stay below the biggest digit its neighbour can hold, and the bigger cell above the smallest. Chains of signs push digits further.
A worked example
Greater Than: the cell in row 4, column 7 is bigger than the cell in row 5, column 7, which is at least 4, so it cannot be 4.
- 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 Greater Than Signs 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.