Hitori
| Min number of participants | 1 |
| Age | 8+ yrs. |
| Safety support by adult | Not required |
| Min duration | 15 min. |
| Cost | Low |
| Environment | Indoor / Outdoor |
A logic puzzle on a numbered grid: shade cells so no number repeats unshaded in any row or column, no two shaded cells touch, and the unshaded cells stay connected.