(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 | |
|---|---|---|---|
 | Medieval Upheaval by Nordy (on 2. July 2022, 08:00) | 74 |  98 % |
| Jackson High by fjam (on 16. November 2022, 18:52) | 35 | 93 % |
| Dyslexic Arrows by Migu (on 6. June 2023, 00:34) | 34 | 91 % |
| Chaos FilloSudokumino by MagnusJosefsson (on 14. September 2022, 15:00) | 141 | 98 % |
| Dandelion (Anti-Knight Thermo Sudoku) by Phistomefel (on 7. June 2022, 02:45) | 158 | 97 % |
| KNAST, BANDIT, GANOVE - Buchstabenrätsel by DocLogic (on 21. February 2020, 18:13) | 34 | 94 % |
| Roller Coaster mit Extras 21 by Uhu (on 22. July 2021, 17:27) | 31 | 99 % |
| 9 Cages by DVFrank (on 4. October 2021, 23:25) | 36 | 98 % |
| Chaos Construction: Quads by XeonRisq (on 23. April 2022, 18:00) | 39 | 91 % |
| Dante's Journey by SenatorGronk (on 30. August 2023, 16:00) | 38 | 97 % |
| One Trick Pony by arbitrary (on 2. July 2024, 00:11) | 78 | 92 % |
| Border Square Sums by Phistomefel (on 15. March 2024, 05:49) | 112 | 98 % |
| Japanische Höhle vom Hein mit Hilfe vom Irrwisch by ibag (on 27. March 2020, 00:00) | 31 | 100 % |
| Maximum Security (Killer cages, Doublers) by AnalyticalNinja (on 8. February 2023, 21:15) | 37 | 96 % |
| Nightmare on Fillo Street by Jay Dyer (on 7. September 2023, 00:37) | 36 | 97 % |
| Call of Cthudoku by juggler (on 17. July 2024, 16:58) | 36 | 99 % |
| Revolver by Myxo (on 2. February 2023, 12:08) | 73 | 92 % |
| Cryptic Kropki Sudoku by Greg (on 25. July 2020, 22:01) | 38 | 98 % |
| Killer Sudoku - Sums or Products by udukos (on 2. November 2020, 20:26) | 39 | 96 % |
| Effective Field Theory by purpl (on 28. September 2021, 02:18) | 39 | 98 % |
