Paperback (19 May 2018)
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The puzzle a 16 x 16 grid made up of 4 x 4 subgrids (called "regions"). Some cells already contain numbers, known as "givens". The goal is to fill in the empty cells, one number in each, so that each column, row, and region contains the numbers 1 through 16 exactly once. Each number in the solution therefore occurs only once in each of three "directions", hence the "single numbers" implied by the puzzle's name.
| ISBN: | 9781719304641 |
| Publisher: | Amazon Digital Services LLC - Kdp |
| Imprint: | Createspace Independent Publishing Platform |
| Pub date: | 19 May 2018 |
| Language: | English |
| Number of pages: | 230 |
| Weight: | 313g |
| Height: | 229mm |
| Width: | 152mm |
| Spine width: | 12mm |
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