The Negative Sudoku Dot System

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Terminology

Before presenting The Negative Sudoku Dot System, let's agree on terminology:

• A cell is a single space, or square, available to a single number.
• A box is a nine-by-nine set of cells. There are nine boxes, arranged like the numbers on a telephone. Box one is in the upper-left-hand corner. Box eight is in the middle of the bottom row.
• A row is a horizontal set of cells, one cell high, nine cells wide. There are nine rows.
• A column is a vertical set of cells, one cell wide, nine cells high. There are nine columns.
• The grid is the entire puzzle.

Identifying a particular cell

(taught by example)

• Square three in box four is highlighted green. This is abbreviated c3b4 (meaning Cell three, Box four).
• Square five in box nine is highlighted red. This is abbreviated c5b9.
• Square seven in box one is highlighted blue. This is abbreviated c7b1.