(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 | |
|---|---|---|---|
 | Half-Baked by tesseralis (on 24. August 2022, 10:41) | 44 |  97 % |
| Ein Geburtstagsgruß von Wachtel, Wechtel, Wochtel und Wuchtel by ibag (on 27. March 2023, 20:00) | 13 | 98 % |
| The Landmark of Entropia by Mad-Tyas (on 30. March 2024, 09:11) | 32 | 92 % |
| Sum Line Sudoku #2 by Phistomefel (on 8. October 2022, 12:57) | 103 | 98 % |
| Little Thermo Killer by Jesper (on 19. June 2020, 23:30) | 53 | 95 % |
| Knapp Daneben Twin Killer Sudoku by Richard (on 24. April 2009, 10:56) | 76 | 94 % |
| Zag by grkles (on 18. March 2021, 11:46) | 45 | 98 % |
| Order! Order! by IcyFruit (on 17. November 2023, 13:57) | 35 | 98 % |
| Delirium (Chaos Construction) by heliopolix (on 25. October 2024, 18:14) | 37 | 99 % |
| Japanese Sum Cave Cipher: Fillomino (Parity) by Niverio (on 18. November 2022, 18:32) | 37 | 100 % |
| 247, 368... by twototenth (on 26. September 2023, 08:00) | 20 | 91 % |
| Crystallizer (Filloku #7) by mormagli (on 30. January 2024, 17:31) | 19 | 99 % |
| Orbit by Qodec (on 16. September 2020, 21:38) | 64 | 100 % |
| Arrowings by kolot (on 25. January 2022, 11:37) | 25 | 96 % |
| Chaos Deconstruction: Position Sums by KNT (on 29. June 2022, 16:05) | 77 | 100 % |
| Constructing a Murder Scene - Chaos Construction (Killer) by Mr.Menace (on 27. July 2022, 13:28) | 81 | 97 % |
| Odd Pentominoes on the Loose by JeffWajes (on 31. July 2022, 05:52) | 27 | 96 % |
| Battleship Deconstruction by wisty (on 27. September 2022, 14:04) | 23 | 93 % |
| Crypto Japanese Cave-Bahn by KNT (on 18. January 2023, 07:32) | 46 | 99 % |
| Utterly A Maze Thing by fjam (on 12. March 2023, 19:01) | 23 | 94 % |
