(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 | |
|---|---|---|---|
 | Beyond the Antihorizon (Black Hole) by heliopolix (on 7. March 2025, 18:04) | 11 |  98 % |
| pull prank by aqjhs (on 6. September 2025, 06:09) | 11 | 100 % |
| Wheel of Fortune (Entropy) by Mad-Tyas (on 26. September 2023, 12:52) | 78 | 96 % |
| Vault Construction by the_cogito (on 12. July 2022, 16:43) | 56 | 98 % |
| Chaos Deconstruction: Cave by KNT (on 6. July 2022, 07:57) | 76 | 96 % |
| Crypto Crypto Japanese Cave by KNT (on 29. December 2022, 18:27) | 39 | 98 % |
| Colossal Masyu Masyu-Sudoku by Christounet (on 8. October 2023, 21:52) | 39 | 99 % |
| Chaos Construction: Exclusions by KNT (on 1. May 2024, 18:08) | 132 | 92 % |
| Arrow Laboratory by PotatoHead21 (on 20. January 2023, 15:12) | 31 | 96 % |
| Crab Net (with Math Pesto) by Paletron (on 29. October 2024, 11:42) | 31 | 96 % |
| Killer Turm by tuace (on 17. November 2013, 09:30) | 46 | 98 % |
| Slingshot Fillomino by Jesper (on 15. September 2020, 08:38) | 43 | 99 % |
| Four houses of Kropki by filuta (on 6. March 2022, 17:42) | 41 | 90 % |
| Balanced Ride (Roller Coaster/Cave) by Piatato (on 23. October 2023, 11:00) | 40 | 99 % |
| Doubler Chaos (Chaos Construction) by Mad-Tyas (on 19. November 2024, 23:39) | 129 | 96 % |
| Rivers and Islands Fillomino by Jesper (on 19. October 2020, 10:04) | 55 | 98 % |
| Ten-Ban by Niverio (on 13. January 2023, 14:54) | 59 | 97 % |
| The Barbed Cross by SSG (on 30. June 2021, 11:26) | 14 | 92 % |
| Diagonal Spiral by antiknight (on 6. July 2022, 22:35) | 34 | 93 % |
| Cryptocombination Knapp Daneben by KNT (on 26. March 2023, 15:26) | 29 | 98 % |
