(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 | |
|---|---|---|---|
 | Double Arrows Arrows by Samish (on 24. September 2022, 10:09) | 16 |  92 % |
| Medieval Upheaval 2 by Nordy (on 6. January 2023, 08:00) | 55 | 98 % |
| Doubling Down by antiknight (on 5. June 2023, 17:59) | 19 | 93 % |
| Take Out 2 by Ennead (on 16. July 2023, 21:36) | 16 | 100 % |
| Serpent's Lair by Chilly (on 13. January 2024, 18:06) | 15 | 96 % |
| Haywire by mathpesto (on 5. September 2024, 22:21) | 35 | 97 % |
| Rätselkombi by Luigi (on 19. July 2010, 13:10) | 59 | 94 % |
| Glückwünsche vom Orion by Statistica (on 9. July 2019, 00:55) | 25 | 100 % |
| Roller Coaster mit Extras 19 by Uhu (on 17. July 2020, 08:45) | 27 | 98 % |
| Antiknight Killer Sudoku 2 by PotatoHead21 (on 6. November 2022, 01:25) | 29 | 91 % |
| Chaos Construction 1 (Little Killer) by Jeet Sampat (on 21. December 2022, 17:33) | 29 | 95 % |
| Entropic Pieces by Myxo (on 11. March 2023, 19:35) | 26 | 98 % |
| Arrows by psninn (on 13. May 2024, 13:03) | 27 | 92 % |
| Little Nuts by Qodec (on 12. May 2021, 12:55) | 38 | 96 % |
| Vers la Flamme by Piatato (on 17. May 2021, 20:39) | 34 | 94 % |
| Outies by Klvsched (on 5. September 2024, 00:33) | 40 | 91 % |
| Gerade Ungerade TaKo by tuace (on 22. March 2014, 10:30) | 44 | 98 % |
| Miami by zetamath (on 28. May 2023, 20:49) | 48 | 99 % |
| Quintuple skyscrapers by zorant (on 6. December 2019, 12:20) | 30 | 95 % |
| Tag 20 - Shakashaka by CJK (on 11. February 2021, 14:56) | 27 | 95 % |
