(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 | |
|---|---|---|---|
 | Quantum X by starwarigami (on 16. January 2022, 12:01) | 21 |  99 % |
| Sudoku Assembly Required by Saphie (on 1. March 2022, 19:57) | 17 | 100 % |
| Mercurial Maxima by AFrayedKnot (on 13. June 2022, 17:59) | 22 | 99 % |
| Thermodynamics (Thermo, Entropy) by Mad-Tyas (on 13. March 2023, 09:36) | 41 | 90 % |
| Killocator: Dead or Alive by starwarigami (on 28. February 2024, 10:17) | 22 | 92 % |
| Nosferatu Crossfire by Mad-Tyas (on 14. January 2025, 08:02) | 18 | 92 % |
| The Lost Sums of Akator by Oripy (on 21. April 2025, 12:00) | 17 | 100 % |
| Overlarge by Jay Dyer (on 1. May 2023, 14:40) | 72 | 98 % |
| Fahrenheit's Vision by Xenonetix (on 11. July 2022, 22:22) | 48 | 99 % |
| Crypto Japanese Twilight Cave by KNT (on 23. October 2022, 06:02) | 48 | 99 % |
| Roller Coaster mit Extras 14 by Uhu (on 28. May 2019, 23:14) | 41 | 98 % |
| Decapitator by NicoD (on 25. May 2025, 05:30) | 45 | 96 % |
| Chaos Deconstruction: Sightlines by KNT (on 11. June 2023, 00:07) | 83 | 95 % |
| Differenzen zwischen Summen III (kryptisch) by tuace (on 17. August 2018, 13:23) | 31 | 99 % |
| Wichtel 2021 (8): Ideenklau im Sparmodus by wichtel (on 17. October 2022, 12:02) | 30 | 100 % |
| Shockwaves by Jay Dyer (on 12. November 2022, 20:32) | 74 | 95 % |
| Fillomino Chaos Construction by dennischen (on 23. May 2023, 08:46) | 67 | 100 % |
| Wildflowers by mathpesto (on 28. May 2023, 18:09) | 74 | 96 % |
| Ausgrabungen in Limcastregos by Luigi (on 25. August 2017, 11:43) | 26 | 92 % |
| Dante's Chaotic Journey by SenatorGronk (on 7. July 2023, 04:16) | 27 | 100 % |
