(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 | |
|---|---|---|---|
 | Riffle Shuffle by 99%Sneaky (on 19. April 2024, 22:52) | 28 |  96 % |
| Low Walls by arbitrary (on 22. May 2024, 20:39) | 57 | 96 % |
| X-Repeat Fillomino by MagnusJosefsson (on 21. May 2021, 13:45) | 41 | 100 % |
| Serial BoX by twototenth (on 23. November 2021, 08:00) | 46 | 97 % |
| Pentomino Yajilin by KNT (on 31. May 2024, 20:24) | 87 | 99 % |
| Killer Kropki Sudoku by Willy Wonka (on 6. September 2020, 17:16) | 47 | 96 % |
| Panorama by Mark Sweep (on 24. March 2021, 22:19) | 14 | 96 % |
| Arjuna by Kafkapharnaum (on 18. July 2021, 23:26) | 18 | 94 % |
| Illithid by PulverizingPancake (on 15. September 2021, 05:53) | 57 | 97 % |
| Harmony by Playmaker6174 (on 3. June 2022, 17:30) | 43 | 97 % |
| QR Code by Ore (on 20. June 2022, 00:00) | 34 | 98 % |
| Osaka (Killer) by Florian Wortmann (on 3. July 2022, 17:14) | 60 | 99 % |
| Wichtel 2021 (3): Erklärnix by wichtel (on 8. July 2022, 12:20) | 14 | 100 % |
| Blackjack by EricRathbun (on 28. January 2023, 23:50) | 17 | 94 % |
| Medieval Upheaval 2 by Nordy (on 6. January 2023, 08:00) | 59 | 97 % |
| Pink Poison by Die Hard (on 23. July 2023, 07:53) | 31 | 92 % |
| Missing Lines by Chad (on 13. August 2023, 15:56) | 15 | 92 % |
| Someday We'll Meet Again by twototenth (on 29. August 2023, 08:00) | 102 | 97 % |
| Little Killer Irrwisch Sudoku by clover (on 23. December 2023, 15:53) | 13 | 94 % |
| MENSCH - Buchstabenrätsel / Letter Puzzle by DocLogic (on 12. June 2024, 16:35) | 27 | 96 % |
