(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 | |
|---|---|---|---|
 | Miami Zipper by Prof.Dori (on 4. February 2024, 16:05) | 57 |  94 % |
| Thermo Sudoku by trivial171 (on 6. September 2020, 19:48) | 52 | 97 % |
| Disconnection by fritzdis (on 12. January 2023, 13:43) | 55 | 96 % |
| Mars Attacks! (2T1L CC) by Xenonetix (on 22. August 2022, 03:33) | 51 | 97 % |
| The Usurper by KMD (on 15. April 2024, 02:09) | 51 | 96 % |
| Japanische Arithmetik II by tuace (on 25. June 2014, 17:30) | 37 | 99 % |
| Twin Rooms (Chaos Construction) by Agent (on 14. June 2022, 09:00) | 41 | 98 % |
| Hidden Full Rank by RockyRoer (on 25. June 2022, 14:45) | 34 | 100 % |
| Unlucky Sevens by noswald (on 7. June 2023, 04:52) | 41 | 93 % |
| Nagaraja [Japanese Sums Cipher Snake Deconstruction] by Christounet (on 12. April 2024, 21:38) | 37 | 98 % |
| Foggy foggy x-sums by sanabas (on 26. July 2024, 07:36) | 38 | 93 % |
| X-sums Killer Sudoku by udukos (on 4. October 2020, 04:28) | 32 | 97 % |
| Shade Your Own Puzzle: Fillomino vs Cave ft. Parity #3 - N difference (13x13) by Playmaker6174 (on 4. January 2025, 03:30) | 33 | 97 % |
| Carousel by twototenth (on 10. August 2021, 08:00) | 24 | 99 % |
| Knotted Arrows by antiknight (on 20. April 2022, 22:34) | 29 | 90 % |
| Antimatter by Nahileon (on 19. December 2022, 21:19) | 54 | 96 % |
| Ten-Ban by Niverio (on 13. January 2023, 14:54) | 56 | 97 % |
| vpermb by zzw (on 25. October 2023, 05:30) | 26 | 99 % |
| Cosmogony by Kafkapharnaum (on 25. March 2024, 17:31) | 33 | 99 % |
| [Fog of War Series] 17.Rule Breakers by AstralSky (on 15. February 2023, 03:58) | 60 | 95 % |
