(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 | |
|---|---|---|---|
 | Chaos Construction: Arukone by Dandelo (on 17. April 2022, 01:27) | 21 |  95 % |
| A Special Tribute: 1K for Zeta! by Playmaker6174 (on 12. May 2022, 08:42) | 23 | 96 % |
| Search Nine Sandwiches by RockyRoer (on 10. August 2023, 05:22) | 20 | 100 % |
| U-Bahn by Piatato (on 14. August 2023, 10:54) | 40 | 98 % |
| One by igniteice (on 29. November 2023, 15:48) | 23 | 93 % |
| Efflorescence by 3good5you (on 29. May 2024, 00:56) | 27 | 95 % |
| Diagonal Regions by Prof.Dori (on 6. October 2024, 14:24) | 20 | 94 % |
| Broken Fence by Myxo (on 2. December 2022, 01:16) | 82 | 98 % |
| Orchid's Revenge by Abdul the Killer (on 1. October 2024, 12:34) | 67 | 96 % |
| pH Anti-Knight Killer Sudoku by udukos (on 18. July 2020, 16:49) | 46 | 95 % |
| Roller Coaster mit Extras 20 by Uhu (on 13. April 2021, 09:31) | 37 | 99 % |
| Anti-Knight Killer Sudoku by SudokuExplorer (on 18. November 2021, 00:00) | 38 | 95 % |
| Killer Sudoku: Mutated Fish by Playmaker6174 (on 20. February 2022, 11:52) | 46 | 97 % |
| Liar Fillomino by KNT (on 16. June 2022, 03:40) | 36 | 99 % |
| Islands 2: Global Ocean by SamuPiano (on 13. July 2023, 03:17) | 80 | 95 % |
| Ocean Spray by Florian Wortmann (on 6. February 2024, 18:50) | 84 | 95 % |
| Loop Count by arbitrary (on 19. September 2024, 21:23) | 41 | 95 % |
| Lake Trip by TotallyNormalCat (on 12. February 2021, 17:30) | 65 | 98 % |
| Kaboom by mathpesto (on 25. November 2023, 13:51) | 86 | 97 % |
| [Fog of War Series] 22.Caged Snakey by AstralSky (on 13. March 2024, 14:02) | 120 | 96 % |
