(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 | |
|---|---|---|---|
 | Ring of Fire by lmdemasi (on 18. December 2023, 15:55) | 57 |  94 % |
| Club 27 (Thermo Sudoku) by Blashyrkh (on 22. March 2024, 22:12) | 96 | 99 % |
| Molopo (XY-Differences Sudoku) by Qodec (on 29. March 2024, 15:34) | 74 | 95 % |
| pollux by aqjhs (on 1. February 2025, 00:00) | 24 | 96 % |
| Campground by Oripy (on 24. March 2025, 12:23) | 21 | 95 % |
| Gee, Officer Kropki by EdTheAlchemist (on 18. November 2025, 13:08) | 53 | 96 % |
| Scientific Method (Killer) by tallcat (on 5. March 2022, 04:46) | 91 | 97 % |
| Pairs Party by Qodec (on 28. August 2021, 11:31) | 64 | 92 % |
| Schlangen im Fillomino-Nest II by tuace (on 3. March 2017, 11:24) | 36 | 99 % |
| As My Guitar Gently Sweeps by Andrewsarchus (on 22. December 2021, 08:42) | 38 | 95 % |
| Renmometers by Jeet Sampat (on 1. June 2022, 21:50) | 44 | 92 % |
| Levity by Emphyrio (on 29. October 2022, 09:51) | 47 | 94 % |
| Vibrations (Killer, Thermo) by Niverio (on 30. September 2023, 17:01) | 132 | 95 % |
| Mictlāntēcutli (Castle Wall + U-Bahn) by sfushidahardy (on 21. May 2025, 05:37) | 41 | 97 % |
| Knight Fever by apiyo (on 31. January 2021, 03:19) | 60 | 96 % |
| Even X-Sums by Realshaggy (on 24. December 2021, 05:00) | 50 | 97 % |
| Where No Snake Has Gone Before by Nordy (on 13. July 2022, 20:43) | 51 | 99 % |
| XV*4.0 by NurglesGift (on 20. November 2024, 18:13) | 141 | 97 % |
| Empire State of Mind (Numbered Rooms Skyscraper) by tallcat (on 12. May 2023, 09:00) | 75 | 94 % |
| Waben Summenhochhauskropki Triple Invers und knapp daneben by Luigi (on 15. February 2010, 12:31) | 32 | 93 % |
