(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 | |
|---|---|---|---|
 | Arrows to the gates of hell by damasosos92 (on 6. February 2024, 23:17) | 14 |  96 % |
| DoubleX-somedoku by sanabas (on 22. July 2024, 09:14) | 15 | 90 % |
| Changeling Confusion by Scojo (on 31. October 2025, 23:31) | 18 | 94 % |
| Apochromat (Masyu RGB) by dumediat (on 22. February 2026, 19:09) | 16 | 98 % |
| Dispersion by Xenonetix (on 25. February 2026, 02:20) | 34 | 99 % |
| Caged Knights Versus The Archers by Jeet Sampat (on 16. May 2023, 18:33) | 42 | 97 % |
| Giant Tapa by wooferzfg (on 25. February 2024, 04:22) | 38 | 91 % |
| Entropy Antimatter by Mad-Tyas (on 5. March 2024, 16:24) | 39 | 93 % |
| Checkered Slitherlink by KNT (on 18. June 2024, 03:12) | 40 | 97 % |
| Sunset Cave by wooferzfg (on 4. May 2025, 08:37) | 39 | 93 % |
| Renban Circus by JeffWajes (on 2. September 2024, 18:54) | 68 | 95 % |
| Agathokakological by NicoD (on 25. June 2025, 05:30) | 70 | 94 % |
| Summation U-Bahn by Agent (on 19. September 2023, 09:00) | 75 | 97 % |
| Roller Coaster mit Extras 5 by Uhu (on 11. March 2018, 13:50) | 63 | 99 % |
| Cycle (Between lines sudoku) by Lizzy01 (on 8. September 2021, 10:45) | 21 | 97 % |
| grow so natural, i eat my kale by aqjhs (on 17. February 2025, 02:30) | 43 | 99 % |
| Double negative by filuta (on 26. January 2025, 12:28) | 21 | 100 % |
| Blueprints (ft. Andrewsarchus) by Nordy (on 14. May 2025, 09:00) | 97 | 99 % |
| Chaos: Killer by lerroyy (on 11. April 2022, 20:42) | 51 | 98 % |
| Japanese Slitherlink by KNT (on 27. October 2024, 22:43) | 53 | 98 % |
