Curated
7| # | Title | Difficulty | Tags | |
|---|---|---|---|---|
| 626 | A knight's return | Easy | ||
| 627 | Flipping two at a time | Easy | ||
| 4 | The mutilated chessboard | Medium | ||
| 623 | Erase two, write their sum minus one | Medium | ||
| 624 | Erase two, write the difference | Medium | ||
| 628 | Tiling with long bricks | Medium | ||
| 625 | A product invariant | Deep |