(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 | |
|---|---|---|---|
 | Cyclic Generators by SirSchmoopy (on 9. August 2022, 22:17) | 22 |  91 % |
| SudokOops by Abdul the Killer (on 2. November 2022, 16:52) | 45 | 91 % |
| Po-Boy by Sniglett (on 1. December 2023, 14:06) | 61 | 95 % |
| Circumlocution by LibardiA (on 12. March 2024, 17:03) | 24 | 94 % |
| Strudel (Killer, Diagonal) by Chefofdeath (on 2. May 2025, 04:28) | 49 | 91 % |
| strudelinseln by aqjhs (on 28. February 2026, 01:23) | 21 | 93 % |
| 10-in-9 calcudoku #2 by Nylimb (on 14. March 2020, 14:49) | 32 | 97 % |
| Phistomefel-Tribute-Thermo-Sudoku by olima (on 19. July 2020, 03:39) | 39 | 92 % |
| Trail of Arrows by SudokuExplorer (on 25. January 2022, 18:30) | 64 | 97 % |
| Sudoku Variants Series (347) - Sudoku Connon by Richard (on 17. November 2021, 00:00) | 70 | 97 % |
| Compass Cave by MagnusJosefsson (on 14. January 2022, 08:26) | 33 | 100 % |
| Entropic Arena by Raumplaner (on 16. October 2022, 12:07) | 37 | 92 % |
| Adulthood by GarlicBredFries (on 5. March 2023, 05:42) | 34 | 95 % |
| Pune by MavericksJD (on 30. March 2023, 12:51) | 108 | 98 % |
| Trick 17 by Mad-Tyas (on 12. December 2023, 12:12) | 67 | 97 % |
| Huitzilopochtli by aqjhs (on 25. December 2024, 13:07) | 78 | 95 % |
| A Hero Emerges by Joseph nehme (on 29. August 2024, 08:04) | 98 | 90 % |
| Whispering Isles by yttrio (on 18. January 2025, 01:44) | 95 | 97 % |
| Stabelle by ICHTUES (on 14. August 2023, 11:00) | 102 | 97 % |
| Chaos Construction: Vision by KNT (on 31. March 2022, 00:50) | 228 | 97 % |
