(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 | |
|---|---|---|---|
 | Open Face Apple by pieguy (on 7. August 2023, 22:49) | 29 |  90 % |
| Transfer Right By 2 by vitaminz (on 24. June 2025, 22:25) | 26 | 90 % |
| Cavernous Construction by GarlicBredFries (on 5. May 2022, 06:47) | 78 | 98 % |
| Serial Killers by starwarigami (on 10. April 2023, 06:44) | 96 | 96 % |
| Wichtel 2017 (4): Drei Wichtel und 144 Häuser by wichtel (on 26. May 2018, 07:04) | 37 | 99 % |
| Above Average On Average (Geometry Experiment 5) by Jeet Sampat (on 22. July 2023, 17:45) | 36 | 94 % |
| Sorted Subway by KNT (on 22. July 2024, 07:21) | 39 | 96 % |
| Detroit by ICHTUES (on 14. November 2021, 06:00) | 51 | 96 % |
| Loop Aquarium by wooferzfg (on 23. October 2022, 20:25) | 45 | 99 % |
| Whispers + Arrows + Renban + Sudoku X by Jeet Sampat (on 14. December 2022, 13:15) | 57 | 96 % |
| Sprengungen im Hochhausviertel II by tuace (on 18. January 2015, 23:36) | 38 | 98 % |
| Pentominoes Intersection by RockyRoer (on 13. September 2021, 00:54) | 26 | 99 % |
| Quorum Rings by Jay Dyer (on 23. October 2021, 17:04) | 46 | 90 % |
| Fujiyama by Myxo (on 14. December 2022, 14:24) | 36 | 99 % |
| Don't open the box by sanabas (on 4. July 2024, 15:05) | 14 | 93 % |
| Prime Killers by Yawnus (on 16. June 2025, 09:02) | 30 | 90 % |
| Schadenfreude by Andrewsarchus (on 11. September 2025, 23:51) | 12 | 100 % |
| Fog of Chaos by lepton (on 26. February 2023, 18:09) | 186 | 92 % |
| Thermo Arrow Sudoku by Phistomefel (on 24. May 2021, 04:16) | 95 | 96 % |
| ripple by mormagli (on 29. November 2022, 22:26) | 82 | 97 % |
