(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 | |
|---|---|---|---|
 | Petits Fours by fjam (on 10. January 2022, 16:41) | 17 |  91 % |
| Chaos Shikaku by KNT (on 30. May 2022, 03:26) | 48 | 98 % |
| It's a Set Up! by riffclown (on 30. June 2022, 19:22) | 38 | 96 % |
| Mongoose by Pallando (on 7. October 2022, 02:25) | 14 | 100 % |
| Elementary by igniteice (on 21. December 2023, 02:40) | 36 | 91 % |
| Cage Growing by Visumation (on 21. October 2024, 15:44) | 52 | 96 % |
| Coordinate Arrows (Sudoku) by Piatato (on 13. February 2022, 18:17) | 112 | 96 % |
| Liar Sudoku - Everything Is Wrogn by DiMono (on 18. September 2020, 19:23) | 89 | 99 % |
| Ouroboroi (Quadruples Sudoku) by clover (on 5. December 2023, 08:05) | 75 | 94 % |
| Parity Party XII, "Herbst" by glum_hippo (on 11. October 2020, 18:05) | 34 | 97 % |
| Wichtel 2021 (9): Tapa-Doppelstern by wichtel (on 26. October 2022, 20:12) | 28 | 94 % |
| Arrow Knight by ademjaz (on 31. December 2022, 11:54) | 71 | 96 % |
| Anti-Knight Killer Sudoku - XL cages by Phistomefel (on 12. June 2020, 12:17) | 121 | 94 % |
| Japanische Summen-Pentominos 2358 by Uhu (on 14. April 2017, 22:48) | 45 | 96 % |
| Japanische Summen-Höhle Prime/Krypto by Uhu (on 10. August 2017, 19:56) | 42 | 99 % |
| Pared Down (Parity Arrow) by tallcat (on 22. January 2022, 22:44) | 48 | 92 % |
| Boxes Clash by Niverio (on 1. May 2022, 09:43) | 48 | 98 % |
| Sudoku Variants Series (371) - Sudoku Hangover by Richard (on 18. May 2022, 01:00) | 52 | 97 % |
| Überlappungssudoku II by Richard (on 29. January 2010, 12:00) | 72 | 92 % |
| Hunhh? by Joseph nehme (on 7. June 2024, 07:06) | 86 | 95 % |
