(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 | |
|---|---|---|---|
 | Mictēcacihuātl (Castle Wall Delta + Directed U-Bahn) by sfushidahardy (on 22. May 2025, 08:11) | 23 |  99 % |
 | I forget what 8 was for by sanabas (on 13. September 2025, 18:12) | 13 | 100 % |
| Archers and Knights by SudokuExplorer (on 23. March 2021, 01:00) | 97 | 98 % |
| ✖ by Gliperal (on 27. June 2021, 08:20) | 93 | 99 % |
| Frak by zetamath (on 20. February 2022, 21:09) | 72 | 98 % |
| Ei8teen by Joseph nehme (on 13. August 2022, 08:19) | 65 | 99 % |
| Hawaii (Spiral Galaxy Sudoku) by PjotrV (on 5. February 2022, 15:04) | 58 | 97 % |
| Third Degree by Die Hard (on 13. February 2024, 11:52) | 62 | 95 % |
| Japanische Höhle mit Irrwisch von den Außerirdischen by ibag (on 27. March 2018, 00:00) | 44 | 99 % |
| Jörmungandr by Jay Dyer (on 2. June 2022, 13:46) | 167 | 99 % |
| Exactly Eighty by krangune (on 23. January 2022, 17:08) | 50 | 97 % |
| It Takes a Village by lmdemasi (on 25. September 2024, 01:09) | 41 | 95 % |
| Enclosure by Xenonetix (on 21. September 2022, 01:11) | 41 | 100 % |
| Chaos Construction: Color Mixing by KNT (on 15. May 2022, 17:41) | 38 | 97 % |
| Sun Chariot by Miky (on 14. April 2021, 00:17) | 43 | 94 % |
| A kyler map [BYO Killer Deconstruction] by Christounet (on 16. October 2023, 18:29) | 33 | 97 % |
| Shadow (Cave Skyscraper Hybrid) by tallcat (on 20. November 2022, 09:00) | 58 | 97 % |
| Ziemlich japanische Summen mit Irrwisch by ibag (on 10. June 2017, 10:00) | 27 | 99 % |
| Locust [Kropki Killer Sudoku] by Panthera (on 12. December 2020, 13:00) | 31 | 93 % |
| In Chaos there is Order by Ali M (on 15. March 2024, 21:55) | 31 | 92 % |
