Four square‑tray challenges: each variant uses the 7 identical polyomino pieces; tray sizes vary. Pack all pieces inside the tray—gaps are allowed, overlaps are not.
Each puzzle has a unique solution based on exhaustive computer search; not formally proven..
| Puzzle # | Polyomino | Tray side (units, square) |
Goal |
|---|---|---|---|
| 1 |  |
8.5382 | Fit 7 copies of the polyomino into the square tray. |
| 2 |  |
8.4971 | Same objective as above. |
| 3 |  |
8.2463 | Same objective as above. |
| 4 |  |
8.9307 | Same objective as above. |
solutions/– solved layout
Puzzle Design
2025 Yuji Katayose – Puzzle 1
2024 Yuji Katayose – Puzzles 2 - 4
CC0 1.0 (public-domain dedication)
Enjoy puzzling!
