(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 | |
|---|---|---|---|
 | Sudoku Assembly Required by Saphie (on 1. March 2022, 19:57) | 23 |  100 % |
| Mercurial Maxima by AFrayedKnot (on 13. June 2022, 17:59) | 25 | 99 % |
| Crypto Japanese Cave with Three Extraterrestrials by KNT (on 21. February 2023, 04:18) | 35 | 100 % |
| Fillomino Chaos Construction by dennischen (on 23. May 2023, 08:46) | 71 | 100 % |
| Double? Or Nothing? [Doublers, Killer, Zeroers] by 3good5you (on 6. August 2023, 06:07) | 14 | 94 % |
| Killocator: Dead or Alive by starwarigami (on 28. February 2024, 10:17) | 23 | 92 % |
| Blade Runner by Kafkapharnaum (on 14. March 2025, 23:39) | 17 | 98 % |
| Erratic U-Bahn by Agent (on 13. June 2025, 09:00) | 22 | 100 % |
| One Above All (Fog) by Rab3aron (on 28. April 2026, 12:16) | 25 | 90 % |
| Shockwaves by Jay Dyer (on 12. November 2022, 20:32) | 75 | 95 % |
| Rollercoaster Deconstruction by tallcat (on 3. April 2023, 20:36) | 69 | 97 % |
| Wildflowers by mathpesto (on 28. May 2023, 18:09) | 77 | 96 % |
| Back to Entropia (Skyscraper, Entropy) by Mad-Tyas (on 20. November 2023, 10:46) | 67 | 97 % |
| Crypto Japanese Twilight Cave by KNT (on 23. October 2022, 06:02) | 49 | 99 % |
| Knapp daneben Twin Killer II by Richard (on 1. January 2010, 12:00) | 41 | 95 % |
| Roller Coaster mit Extras 14 by Uhu (on 28. May 2019, 23:14) | 41 | 98 % |
| Loopy Territories by masetab (on 1. February 2026, 15:06) | 51 | 96 % |
| Ausgrabungen in Limcastregos by Luigi (on 25. August 2017, 11:43) | 26 | 92 % |
| The Song of the Serpent and the Wanderer - A tribute to Nordy by damasosos92 (on 17. July 2023, 03:40) | 65 | 94 % |
| Nabner Doubledeal by Jay Dyer (on 20. September 2023, 13:35) | 54 | 96 % |
