---- Kerry asked: Is there a relatively simple way to find a 16x16 grid using the numbers 0-15 that satisfies the standard sudoku/hexadoku requirements and has the sum of each contiguous 4x4 block the same? Kerry, this example should satisfy your requirements. Sum of each contiguous 4x4 block = 120. And using a simple way, as you asked. Christian. www.multimagie.com/indexengl.htm 0 1 2 3 | 4 5 6 7 | 8 9 10 11 | 12 13 14 15 4 5 6 7 | 8 9 10 11 | 12 13 14 15 | 0 1 2 3 8 9 10 11 | 12 13 14 15 | 0 1 2 3 | 4 5 6 7 12 13 14 15 | 0 1 2 3 | 4 5 6 7 | 8 9 10 11 ----------------------------------------------------- 1 2 3 0 | 5 6 7 4 | 9 10 11 8 | 13 14 15 12 5 6 7 4 | 9 10 11 8 | 13 14 15 12 | 1 2 3 0 9 10 11 8 | 13 14 15 12 | 1 2 3 0 | 5 6 7 4 13 14 15 12 | 1 2 3 0 | 5 6 7 4 | 9 10 11 8 ----------------------------------------------------- 2 3 0 1 | 6 7 4 5 | 10 11 8 9 | 14 15 12 13 6 7 4 5 | 10 11 8 9 | 14 15 12 13 | 2 3 0 1 10 11 8 9 | 14 15 12 13 | 2 3 0 1 | 6 7 4 5 14 15 12 13 | 2 3 0 1 | 6 7 4 5 | 10 11 8 9 ----------------------------------------------------- 3 0 1 2 | 7 4 5 6 | 11 8 9 10 | 15 12 13 14 7 4 5 6 | 11 8 9 10 | 15 12 13 14 | 3 0 1 2 11 8 9 10 | 15 12 13 14 | 3 0 1 2 | 7 4 5 6 15 12 13 14 | 3 0 1 2 | 7 4 5 6 | 11 8 9 10