(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 | |
|---|---|---|---|
 | Decagon by Jolly Rogers (on 12. September 2025, 13:04) | 60 |  97 % |
| Masyu Hexuro by Nell Gwyn (on 21. September 2025, 04:23) | 16 | 95 % |
| Bitsum Lines by RockyRoer (on 29. November 2025, 13:26) | 14 | 91 % |
| Doppel-renbän-ger by Manta-Ray (on 6. December 2025, 14:34) | 36 | 95 % |
| Dutch Flat Mates: Dual Duel by aqjhs (on 3. January 2026, 01:59) | 23 | 91 % |
| Pi-ratios of the Caribbean by ThePedallingPianist (on 28. January 2026, 01:13) | 17 | 91 % |
| Broken chain, missing links by NicoD (on 7. February 2026, 05:30) | 44 | 92 % |
| A tilt at full rank by ralphwaldo1 (on 8. February 2025, 19:16) | 111 | 98 % |
| Clapping on the 1 and 3 by cristophermoore (on 6. November 2023, 00:00) | 83 | 94 % |
| 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 % |
| Pentonimo Kakuro by julius64 (on 4. May 2013, 14:24) | 53 | 96 % |
| M-Bahn (Modular U-Bahn) by cyddrdrd (on 12. July 2025, 00:00) | 60 | 99 % |
| Godzilla in Sudokutown by FryTheGuy (on 21. September 2021, 05:35) | 57 | 98 % |
| Wrogn Answers Only by jwsinclair (on 19. October 2022, 19:44) | 215 | 98 % |
| Area 81 by mathpesto (on 31. January 2023, 19:44) | 91 | 96 % |
| Equality Cube by Sniglett (on 4. December 2023, 00:56) | 46 | 96 % |
| ROCK STAR - Buchstabenrätsel by DocLogic (on 5. February 2020, 19:28) | 38 | 92 % |
| Atom by Jobo (on 8. May 2024, 21:34) | 45 | 90 % |
| Waves by RandyDan (on 10. January 2026, 12:04) | 39 | 93 % |
