(Very) Hard AND nice puzzles
The following list contains portal puzzles that have been rated as nice or very nice and that are difficult. These puzzles are recommended for experts - and allow some time to solve.
| Description | solved | Rating | |
|---|---|---|---|
 | Pairity (Parity Pairrows) by EnPee (on 5. January 2025, 17:06) | 21 |  90 % |
| One Set of Killer Arrows by Jolly Rogers (on 7. January 2025, 18:50) | 47 | 93 % |
| Decagon by Jolly Rogers (on 12. September 2025, 13:04) | 61 | 97 % |
| Masyu Hexuro by Nell Gwyn (on 21. September 2025, 04:23) | 16 | 95 % |
| Bitsum Lines by RockyRoer (on 29. November 2025, 13:26) | 15 | 91 % |
| Pi-ratios of the Caribbean by ThePedallingPianist (on 28. January 2026, 01:13) | 18 | 91 % |
| Broken chain, missing links by NicoD (on 7. February 2026, 05:30) | 50 | 92 % |
| Colorful Squares by Rab3aron (on 18. May 2026, 11:11) | 68 | 96 % |
| Chaos Construction: Gaps by KNT (on 29. March 2022, 07:47) | 110 | 91 % |
| Wrogn Answers Only by jwsinclair (on 19. October 2022, 19:44) | 217 | 98 % |
| XV Kropki Sudoku by Philipp Huber (on 28. November 2020, 15:14) | 81 | 94 % |
| Wingnuts by FullDeck-Missing (on 7. September 2024, 13:09) | 73 | 92 % |
| M-Bahn (Modular U-Bahn) by cyddrdrd (on 12. July 2025, 00:00) | 61 | 99 % |
| Godzilla in Sudokutown by FryTheGuy (on 21. September 2021, 05:35) | 57 | 98 % |
| [TSL][S2T1] Turn 1 by yttrio (on 14. March 2026, 01:00) | 56 | 94 % |
| Colored Groups by Nahileon (on 8. October 2025, 15:50) | 101 | 96 % |
| Archaeology (Nonconsecutive arrow sudoku) by Qodec (on 4. September 2023, 13:45) | 109 | 95 % |
| Pentomino Schleifen by Richard (on 8. October 2010, 12:00) | 52 | 90 % |
| Area 81 by mathpesto (on 31. January 2023, 19:44) | 92 | 96 % |
| Equality Cube by Sniglett (on 4. December 2023, 00:56) | 46 | 96 % |
