(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 | |
|---|---|---|---|
 | DEATH (collaboration) by grkles (on 4. January 2022, 22:20) | 43 |  99 % |
| Imaginary Cages by brandon_bot (on 1. May 2022, 21:14) | 29 | 97 % |
| Activated Japanese Sums by RockyRoer (on 12. November 2022, 13:36) | 21 | 95 % |
| Pandora's Renban by JeffWajes (on 18. January 2023, 21:12) | 49 | 97 % |
| The Chained Trio (Between x Lockout x Double Arrow) by Playmaker6174 (on 19. March 2023, 18:23) | 26 | 96 % |
| Arrow Jungle by PotatoHead21 (on 18. August 2023, 11:49) | 24 | 93 % |
| Yin-Yang Renbanominos 1 by Die Hard (on 29. April 2024, 07:56) | 25 | 92 % |
| Thirteen Ghosts by mathpesto (on 19. September 2024, 22:37) | 72 | 98 % |
| Summon by KNT (on 28. December 2025, 14:26) | 23 | 100 % |
| 10-in-9 killer sudoku #3 by Nylimb (on 11. February 2020, 22:35) | 45 | 99 % |
| Japanische Bahnhöfe, Teil 2 by pirx (on 27. May 2020, 13:00) | 26 | 99 % |
| Open Face Apple by pieguy (on 7. August 2023, 22:49) | 30 | 90 % |
| Transfer Right By 2 by vitaminz (on 24. June 2025, 22:25) | 29 | 90 % |
| U-Bahn mit Haltestellen III by tuace (on 28. March 2016, 16:22) | 47 | 95 % |
| Temperature (Thermo, Entropy) by Mad-Tyas (on 30. January 2023, 08:22) | 55 | 94 % |
| Irrwisch Sudoku: Sandwich by Gliperal (on 22. May 2023, 11:30) | 50 | 99 % |
| Wichtel 2016 (12 und Schluss): Unterirdische Katakomben mit Kerzenbeleuchtung by wichtel (on 12. October 2017, 21:01) | 26 | 98 % |
| Chaos Sum-dok-U-Bahn by Christounet (on 9. December 2024, 08:07) | 27 | 99 % |
| Asterias (Pentopia U-Bahn) by MaizeGator (on 22. July 2025, 05:19) | 28 | 96 % |
| Rundweg Family Photo by pokerke (on 14. February 2011, 00:57) | 83 | 99 % |
