San Francisco Chronicle - (Sunday)
SUDOkU mOnSTER
Directions: Every row, column and 4-by-4 box must contain 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F.
San Francisco Chronicle - (Sunday)
Directions: Every row, column and 4-by-4 box must contain 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F.