(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 | |
|---|---|---|---|
 | Empty Vessels by Die Hard (on 14. April 2026, 08:28) | 91 |  97 % |
| Chaos Construction: Circle Sum (9x9) by Jesper (on 15. January 2024, 15:10) | 104 | 100 % |
| Offset Chaos by arbitrary (on 29. January 2025, 00:53) | 62 | 99 % |
| Disconnection by fritzdis (on 12. January 2023, 13:43) | 68 | 97 % |
| X (Chaos Construction) by tallcat (on 11. April 2024, 07:00) | 78 | 98 % |
| Japanische Arithmetik II by tuace (on 25. June 2014, 17:30) | 38 | 99 % |
| Danke für die tolle Zeit! by ibag (on 10. February 2018, 16:00) | 34 | 99 % |
| 4-color killer sudoku #1 by Nylimb (on 18. February 2021, 04:42) | 24 | 98 % |
| Spotlight (Anti-King Arrow Sudoku) by EliasKar (on 5. May 2021, 18:18) | 29 | 99 % |
| Ones and Twos by FryTheGuy (on 9. November 2021, 02:27) | 35 | 96 % |
| Disjoint X Arrows by Mesmer (on 15. October 2021, 20:44) | 17 | 92 % |
| Sudon'tku by IsaacR (on 19. November 2021, 06:52) | 33 | 92 % |
| Renban-na-na-na-na-na by SirSchmoopy (on 18. March 2022, 02:30) | 25 | 100 % |
| Quantum Whispers by tesseralis (on 17. July 2022, 01:09) | 23 | 100 % |
| Wichtel 2021 (5): Fehlkommunikation by wichtel (on 12. August 2022, 20:21) | 26 | 99 % |
| Half-Baked by tesseralis (on 24. August 2022, 10:41) | 45 | 98 % |
| Battleship Deconstruction by wisty (on 27. September 2022, 14:04) | 29 | 93 % |
| Antimatter by Nahileon (on 19. December 2022, 21:19) | 56 | 96 % |
| [Fog of War Series] 17.Rule Breakers by AstralSky (on 15. February 2023, 03:58) | 64 | 95 % |
| Snakomino Warp Zones [Level #3] by Christounet (on 11. April 2023, 22:22) | 26 | 99 % |
