(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 | |
|---|---|---|---|
 | Nurimisaki Killer by Jay Dyer (on 27. March 2023, 18:51) | 54 |  98 % |
| Antiknight Thermo Sudoku by PotatoHead21 (on 26. July 2023, 18:25) | 46 | 96 % |
| Boxed Rooms (Chaos Construction) by thoughtbyte (on 26. August 2023, 13:01) | 55 | 96 % |
| Order Out Of Chaos by zzw (on 16. November 2023, 00:45) | 29 | 100 % |
| Desert Deity by DadJokes (on 1. December 2023, 19:43) | 35 | 95 % |
| The 12 Pentominoes of Christmas (Chaos) by DadJokes (on 8. January 2024, 15:19) | 22 | 100 % |
| The Colour out of Space (Black Hole #6) by heliopolix (on 31. March 2024, 22:23) | 15 | 92 % |
| Constance by lerroyy (on 17. May 2024, 11:20) | 17 | 100 % |
| Afar by Andrewsarchus (on 28. June 2024, 08:57) | 14 | 91 % |
| Flat Cosmos (Chaos Construction) by sfushidahardy (on 13. August 2024, 23:53) | 62 | 99 % |
| Send In The Clones by Jay Dyer (on 25. September 2024, 23:03) | 18 | 93 % |
| It Takes a Village by lmdemasi (on 25. September 2024, 01:09) | 36 | 95 % |
| Try-ominos by damasosos92 (on 26. September 2024, 20:37) | 25 | 100 % |
| ✖ by Gliperal (on 27. June 2021, 08:20) | 78 | 99 % |
| Ei8teen by Joseph nehme (on 13. August 2022, 08:19) | 59 | 99 % |
| Tag 24 - Finale by CJK (on 20. February 2021, 14:48) | 45 | 97 % |
| Chained Killer Sudoku by Shinya (on 12. January 2020, 23:22) | 42 | 94 % |
| Chillicothe by glum_hippo (on 4. October 2023, 18:11) | 44 | 95 % |
| Disjoint group little killer sudoku X by Lizzy01 (on 4. March 2021, 21:40) | 38 | 98 % |
| Chaos CaveSudoku by MagnusJosefsson (on 7. December 2022, 11:55) | 75 | 98 % |
