Solve each sudoku puzzle while gaining the correct number of yards in each row. Moving from left to right in a row, each cell represents the number of yards gained on a down.
Each time you reach a total of 10 yards, you start over at first down for the next play. If you don't get at least 10 yards within 3 downs, then you must punt and the total for that row freezes at that point. Any future plays in that row are ignored.
For larger puzzles, the numbers 0-8 (not 1-9) are used, and smaller puzzles use 1-6. Each digit must appear once in each row, column, and block. Additionally, the yards gained must match the number given to the left of each row.