(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 | |
|---|---|---|---|
 | Knights of Parity by Fafrd (on 27. May 2022, 06:38) | 18 |  96 % |
| Chaos Shikaku by KNT (on 30. May 2022, 03:26) | 48 | 98 % |
| It's a Set Up! by riffclown (on 30. June 2022, 19:22) | 38 | 96 % |
| Mongoose by Pallando (on 7. October 2022, 02:25) | 14 | 100 % |
| Many happy returns (Land survey/Quadruples/Chaos Construction/Cipher) by dumediat (on 10. February 2023, 13:42) | 17 | 98 % |
| Ouroboroi (Quadruples Sudoku) by clover (on 5. December 2023, 08:05) | 78 | 94 % |
| Elementary by igniteice (on 21. December 2023, 02:40) | 38 | 91 % |
| [Fog of War Series] 22.Caged Snakey by AstralSky (on 13. March 2024, 14:02) | 124 | 96 % |
| Renban shifted x-sums by Lizzy01 (on 20. July 2024, 22:55) | 15 | 93 % |
| Scorpion by udukos (on 1. January 2022, 14:10) | 63 | 96 % |
| Kropki Nurimisaki by tallcat (on 1. February 2023, 08:00) | 71 | 94 % |
| One Look Could Kill by yttrio (on 23. November 2024, 01:54) | 67 | 93 % |
| Anti-Knight Killer Sudoku - XL cages by Phistomefel (on 12. June 2020, 12:17) | 126 | 94 % |
| Fault Lines by SeveNateNine (on 20. February 2025, 07:54) | 57 | 97 % |
| Medieval Upheaval 3 by Nordy (on 22. January 2024, 08:30) | 85 | 99 % |
| Hunhh? by Joseph nehme (on 7. June 2024, 07:06) | 89 | 95 % |
| Parity Party XII, "Herbst" by glum_hippo (on 11. October 2020, 18:05) | 34 | 97 % |
| Kropki'd X-sums sudoku by Nylimb (on 3. November 2020, 02:50) | 31 | 95 % |
| Antiknight Cross by Raumplaner (on 18. December 2021, 16:08) | 35 | 94 % |
| Wichtel 2021 (9): Tapa-Doppelstern by wichtel (on 26. October 2022, 20:12) | 28 | 94 % |
