(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 | |
|---|---|---|---|
 | Dotropy (Entropic sudoku with kropki pairs) by Qodec (on 14. May 2023, 17:30) | 67 |  95 % |
| Lattice by DVFrank (on 3. September 2021, 16:38) | 37 | 98 % |
| Louisville by ICHTUES (on 6. February 2022, 06:00) | 31 | 96 % |
| Chaos Construction: Quads by XeonRisq (on 23. April 2022, 18:00) | 37 | 93 % |
| Cipher Hungarian Tapa by the_cogito (on 5. April 2023, 21:49) | 32 | 94 % |
| X-clusi-V-ty by tesseralis (on 12. August 2023, 02:26) | 31 | 95 % |
| Dante's Journey by SenatorGronk (on 30. August 2023, 16:00) | 36 | 97 % |
| Zipper Galaxies by gdc (on 4. February 2024, 18:44) | 37 | 98 % |
| 9 Cages by DVFrank (on 4. October 2021, 23:25) | 34 | 97 % |
| Modscrapers by grkles (on 15. November 2021, 04:28) | 33 | 99 % |
| Primesweeper: Strongbox by grkles (on 3. December 2021, 18:42) | 32 | 97 % |
| Jackson High by fjam (on 16. November 2022, 18:52) | 35 | 93 % |
| Dyslexic Arrows by Migu (on 6. June 2023, 00:34) | 34 | 91 % |
| Call of Cthudoku by juggler (on 17. July 2024, 16:58) | 34 | 99 % |
| It Makes No Difference by juggler (on 19. August 2024, 11:37) | 35 | 93 % |
| Dandelion (Anti-Knight Thermo Sudoku) by Phistomefel (on 7. June 2022, 02:45) | 155 | 97 % |
| One Trick Pony by arbitrary (on 2. July 2024, 00:11) | 75 | 92 % |
| KNAST, BANDIT, GANOVE - Buchstabenrätsel by DocLogic (on 21. February 2020, 18:13) | 34 | 94 % |
| Japanische Höhle vom Hein mit Hilfe vom Irrwisch by ibag (on 27. March 2020, 00:00) | 30 | 100 % |
| Roller Coaster mit Extras 21 by Uhu (on 22. July 2021, 17:27) | 31 | 99 % |
