- The sudoku grid consists of nine horizontal rows, nine vertical columns, and nine 3 x 3 blocks (also called boxes).
- Rows, columns and block are all kinds of unit.
- There are twenty-seven units in a grid.
- Every unit contains nine cells, and every unit must contain the digits 1 through 9.
- Cells that share a unit (row, column or block) are called buddies.
- The numbers already in the grid are the puzzle's clues.
- The numbers you add, as a player, are "big numbers".
- When you have an empty cell, the numbers which could go into it according to the rules of the game are the empty cell's candidates, also known as pencil-marks.
- Rows are numbered 1 to 9, top to bottom. Columns are numbered 1 to 9, left to right. Blocks are numbered 1 to 9, in this layout:
1 2 3 4 5 6 7 8 9
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| What People Say |
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 Just super for a sudoku maniac like me. Thank you for a great software. I tell all Sudoku fanatics about your software. Have been doing Sudoku puzzle for at least 3 years and by far your site and software is the best. Congratulations for a great product and site. The 20 bucks I have invested is the best investment I have made in the last 2 years. Congratulations and again thank you.  Maurice Daoust, Canada |
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Last Updated
14 Mar 2010
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