(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 | |
|---|---|---|---|
 | Disambiguation by Flywinged (on 5. February 2023, 01:07) | 19 |  91 % |
| BYOX by randall (on 11. July 2023, 10:10) | 17 | 92 % |
| Polymorphic Chaos by thoughtbyte (on 22. August 2023, 13:53) | 68 | 97 % |
| Faultline (Filloku #4) by mormagli (on 12. October 2023, 20:15) | 30 | 100 % |
| Eiger (Killer sudoku) by Qodec (on 3. December 2023, 15:41) | 140 | 97 % |
| Medieval Buffet by Manta-Ray (on 16. September 2024, 14:11) | 27 | 94 % |
| Pointed Chaos by yttrio (on 30. June 2023, 20:03) | 95 | 98 % |
| Suguru Chaos Deconstruction: Anti Equites by crispy16 (on 14. May 2022, 02:25) | 53 | 98 % |
| Ancient Ruins (Fog, BYO Killer, Nurikabe) by lepton (on 6. February 2023, 16:24) | 62 | 95 % |
| Anti-Knight Little Killer Sudoku by udukos (on 28. August 2020, 05:29) | 47 | 96 % |
| Antiknight Between Lines by Gliperal (on 12. May 2021, 04:19) | 38 | 97 % |
| Perforate by Xendari (on 14. July 2022, 08:22) | 36 | 98 % |
| Crypto Japanese Cave from the Underworld by KNT (on 30. October 2022, 05:29) | 36 | 99 % |
| Equilibrium by Mad-Tyas (on 1. November 2022, 09:41) | 63 | 98 % |
| Eine Koralle by matter (on 24. May 2015, 08:51) | 28 | 93 % |
| Extreme Lunchbox by Undar_Beyond (on 15. May 2020, 20:32) | 32 | 90 % |
| Teenage Dream by starwarigami (on 6. September 2022, 07:37) | 55 | 97 % |
| Slythering [Liar Japanese Sums Snake] by Christounet (on 4. June 2024, 07:54) | 27 | 100 % |
| The Red and the Black (Anti-King Arrow) by tallcat (on 18. October 2021, 15:41) | 50 | 92 % |
| WPC 2016 Training - Pentominos by uvo (on 12. July 2017, 15:33) | 38 | 98 % |
