(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 | |
|---|---|---|---|
 | Turtle by Arka Badarka (on 15. July 2021, 04:20) | 25 |  93 % |
| Ultraviolet by grkles (on 13. September 2021, 16:33) | 35 | 98 % |
| Battle With The Archers 26: Reunion (aka Unity II) by Playmaker6174 (on 7. January 2022, 09:17) | 54 | 97 % |
| Noch ein Instructionless by ibag (on 17. February 2022, 23:58) | 19 | 99 % |
| Vector Field [Arrow, Killer] by Miky (on 28. April 2022, 19:43) | 22 | 96 % |
| Gyroscope 3.0 by Ambrose (on 7. August 2022, 17:46) | 49 | 97 % |
| All Around by Joseph nehme (on 22. October 2022, 09:22) | 24 | 90 % |
| Parity Party XXVIII, "Party Mirror" by glum_hippo (on 30. March 2023, 13:57) | 34 | 94 % |
| Heat Intensity by Calesch (on 13. August 2024, 05:09) | 23 | 94 % |
| Split Pea Loup by yttrio (on 21. September 2024, 04:46) | 31 | 92 % |
| Cat Fun by Scojo (on 24. November 2024, 07:55) | 71 | 95 % |
| 2025 Chaotic X-Sums (9x9) by Florian Wortmann (on 25. January 2025, 14:34) | 152 | 97 % |
| Wraparound by mathpesto (on 29. June 2025, 23:31) | 23 | 94 % |
| Bicentenary by NicoD (on 5. September 2025, 05:30) | 26 | 92 % |
| Deep Dive Twenty-Five (Killer sudoku) by sujoyku (on 25. October 2025, 14:09) | 125 | 94 % |
| Solo by Kaktuslav (on 23. November 2025, 10:00) | 28 | 98 % |
| Hooked (Region Sum Lines) by Florian Wortmann (on 11. August 2024, 12:24) | 191 | 97 % |
| *100* Doppelter Pentomino-Rundweg by Richard (on 17. June 2009, 21:00) | 99 | 95 % |
| Imprisoned (Killer Rooms Sudoku) by Agent (on 2. July 2022, 09:00) | 89 | 99 % |
| Flower by zetamath (on 6. January 2021, 23:12) | 83 | 94 % |
