(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 | |
|---|---|---|---|
 | Focus on Symmetry by Mad-Tyas (on 4. October 2024, 10:26) | 42 |  95 % |
| Hakyuu-Hitori Kombi by pwahs (on 28. June 2011, 11:36) | 49 | 97 % |
| Gerade Ungerade Tapa-Höhle by tuace (on 7. December 2015, 12:20) | 45 | 99 % |
| Why Can't We Be Friends? by SlowLarry (on 21. December 2020, 22:06) | 26 | 98 % |
| Trigonometry (Killer Sudoku) by emmettcito (on 26. April 2021, 20:04) | 27 | 99 % |
| Anti-Knight Thermos 2 by Jeet Sampat (on 4. January 2023, 10:47) | 77 | 98 % |
| Double Filtration by Jay Dyer (on 2. February 2023, 19:28) | 55 | 97 % |
| Re(cursive/entry) by mormagli (on 25. June 2024, 21:03) | 23 | 95 % |
| Destin Sunset (YIN-Yang Fillomino) by MaizeGator (on 1. August 2024, 15:39) | 26 | 99 % |
| Mystery Room Somedoku by blackjackfitz (on 18. August 2024, 15:01) | 25 | 90 % |
| Schlangen im Fillomino-Nest III by tuace (on 3. March 2017, 11:24) | 28 | 99 % |
| T-Time (Anti-Knight Renban Killer Sudoku) by Phistomefel (on 13. June 2023, 21:12) | 166 | 97 % |
| Dritter Pfeilchenstrauß by glum_hippo (on 10. September 2020, 22:00) | 22 | 96 % |
| Double the Math - Mystery by Mad-Tyas (on 25. May 2021, 07:49) | 18 | 92 % |
| An Homage To Simon by Ronnyson (on 30. August 2021, 11:58) | 19 | 94 % |
| Beispiel für Roller Coaster mit Extras 25 by Uhu (on 3. March 2022, 06:35) | 24 | 100 % |
| Aligned by Jagga (on 23. December 2022, 05:19) | 21 | 91 % |
| Death Spiral by EricRathbun (on 4. February 2023, 18:12) | 23 | 93 % |
| Sandwich Boxes by Ennead (on 8. June 2023, 20:31) | 33 | 92 % |
| Rubik's Cube by juggler (on 22. February 2024, 02:25) | 60 | 95 % |
