(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 | |
|---|---|---|---|
 | Toroidal Chess Sudoku #3 - Thermo by Rotstein (on 10. June 2020, 21:07) | 19 |  96 % |
| Z-Sums Sudoku 3 by Semax (on 4. October 2020, 08:21) | 17 | 98 % |
| Araf's Lunchbox (6x6) by udukos (on 17. June 2021, 21:54) | 13 | 98 % |
| Rounding Errors by Eclectic_Hoosier (on 12. May 2021, 16:52) | 18 | 96 % |
| Killers 123...go by abed hawila (on 21. May 2021, 09:02) | 60 | 95 % |
| Shuriken 手裏剣 by ___ (on 1. July 2021, 14:06) | 17 | 94 % |
| Connon by PrimeWeasel (on 4. July 2021, 11:06) | 28 | 93 % |
| 45+45=90 by the_cogito (on 18. October 2021, 15:23) | 12 | 98 % |
| A Horse with No Name (Broken 159) by purpl (on 2. January 2022, 18:01) | 45 | 97 % |
| Knuckle Sandwich by PrimeWeasel (on 31. January 2022, 10:07) | 13 | 92 % |
| Renbanage by Celery (on 14. November 2022, 00:58) | 31 | 94 % |
| Consistency (Equalines Sudoku) by Mad-Tyas (on 6. November 2023, 08:46) | 49 | 96 % |
| Kropki-Masyudoku by Lizzy01 (on 21. January 2024, 18:43) | 20 | 94 % |
| Scorching paperclips by NicoD (on 28. June 2025, 05:30) | 50 | 95 % |
| Four-Ring Circus by Nebuzaradan (on 19. September 2025, 18:36) | 14 | 96 % |
| Adventskalender 2025, Türchen 14 - Adventskerzen by Zzzyxas (on 14. December 2025, 07:00) | 31 | 97 % |
| Wichtels Rätselherbst 2025 (11): Adventskalender-Rekonstruktion by wichtel (on 30. November 2025, 20:25) | 14 | 96 % |
| Chaotic Meidjuluk #3 by PrimeWeasel (on 12. January 2026, 15:29) | 14 | 100 % |
| Extremities by Joseph nehme (on 10. July 2024, 08:06) | 104 | 95 % |
| Smashboy by mathpesto (on 31. July 2022, 20:12) | 71 | 94 % |
