(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 | |
|---|---|---|---|
 | Parhelion by Shinya (on 2. September 2021, 00:09) | 70 |  99 % |
| Flying Arrows by antiknight (on 2. March 2022, 19:36) | 45 | 92 % |
| Lobster Bisque (Chaos Construction) by Tacosian (on 23. November 2023, 21:57) | 38 | 99 % |
| Chocona Mall by Jay Dyer (on 16. August 2024, 21:19) | 21 | 93 % |
| Semi-Symmetry by Lizzy01 (on 20. September 2024, 11:44) | 24 | 97 % |
| N-Lines by Qodec (on 6. August 2025, 16:53) | 20 | 91 % |
| Thermohaline (Nurikabe Thermo Sudoku) by Agent (on 11. October 2022, 09:00) | 42 | 99 % |
| TENtropy by Mad-Tyas (on 9. May 2023, 09:02) | 47 | 94 % |
| Chaos Construction: Yin Yang (9x9) by Jesper (on 22. May 2022, 10:39) | 115 | 100 % |
| Eddies by Qodec (on 12. January 2021, 22:41) | 70 | 99 % |
| Arrowings by kolot (on 25. January 2022, 11:37) | 26 | 96 % |
| Regional Chaos by arbitrary (on 11. January 2025, 19:00) | 24 | 95 % |
| Chaos Construction: Circle Sum (9x9) by Jesper (on 15. January 2024, 15:10) | 99 | 100 % |
| Dynamic Duos by Niverio (on 22. August 2021, 17:32) | 51 | 98 % |
| The Cross by Tom1i (on 15. December 2020, 15:06) | 60 | 99 % |
| Chaos Fillomino - Border Gaps #2 by Mark Sweep (on 21. December 2022, 10:00) | 32 | 99 % |
| Hoverbike by tesseralis (on 10. July 2023, 04:47) | 32 | 98 % |
| Send In The Clones by Jay Dyer (on 25. September 2024, 23:03) | 31 | 93 % |
| Dismay (Region Sum Lines Sudoku) by Qodec (on 29. June 2022, 22:50) | 74 | 97 % |
| Halligen Knapp Daneben by KNT (on 12. January 2023, 01:08) | 32 | 100 % |
