sudoku 8x8

the rules of 8x8 Sudoku:

• The puzzle is played on an 8x8 grid, instead of a 9x9 grid.

• There are 8 numbers to choose from (1, 2, 3, 4, 5, 6, 7, and 8).

• Each row, column, and 4x4 block must contain each of the numbers 1, 2, 3, 4, 5, 6, 7, and 8 exactly once.