Sudoku HowTo

Buddy Cells

A Buddy Cell is any cell that is in the same units (row, column or box) as the cell you are working on. The content of a cell will influence all it's Buddy Cells.

Each cell in a 9 x 9 Sudoku puzzle has 20 buddy cells.

In Figure 1 all the Buddy Cells of the red cell in row 4 column 8 are yellow.

Any cell cannot have a value in it that is already placed in any of it's buddy cells.

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This page last updated on February 21, 2015