(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 | |
|---|---|---|---|
 | Square of Squares by juggler (on 12. May 2025, 21:33) | 82 |  97 % |
| Wichtel 2019 (4): Unvollendet ausgegraben by wichtel (on 17. August 2020, 20:10) | 25 | 99 % |
| Steering Wheel (Classic) by SudokuExplorer (on 14. August 2021, 02:00) | 64 | 91 % |
| Battle With The Archers 34 - The Climax: The Vow of Three Worlds by Playmaker6174 (on 15. July 2022, 08:06) | 83 | 97 % |
| Arrangement by wooferzfg (on 23. September 2022, 07:34) | 65 | 96 % |
| Chaos in all Regions by Bother__ (on 4. December 2022, 21:29) | 32 | 92 % |
| Arrow Courtyard by PotatoHead21 (on 16. February 2023, 10:33) | 32 | 95 % |
| Thermo Unicorn by NurglesGift (on 6. January 2024, 12:35) | 34 | 92 % |
| Ominous Yajilin by Jay Dyer (on 23. June 2024, 21:12) | 55 | 96 % |
| Three is a Crowd Sudoku by rk1970 (on 22. April 2020, 09:26) | 42 | 95 % |
| pH Anti-Knight Killer Sudoku by udukos (on 18. July 2020, 16:49) | 51 | 94 % |
| Baba is Anti-Knight by FryTheGuy (on 16. October 2021, 21:36) | 41 | 97 % |
| What are the odds? (Parity killer/little killer) by sujoyku (on 18. August 2023, 10:15) | 43 | 94 % |
| 100 by Klvsched (on 14. August 2024, 12:51) | 45 | 94 % |
| Nun Gimel Hay Shin - A Chanukah Sudoku by Mojo872 (on 15. December 2022, 06:12) | 60 | 94 % |
| K2 (Anti-diagonal arrow sudoku) by Qodec (on 28. October 2023, 17:22) | 75 | 97 % |
| Parity Mirror by zegres (on 2. May 2022, 04:41) | 84 | 100 % |
| [Fog of War Series] 22.Caged Snakey by AstralSky (on 13. March 2024, 14:02) | 135 | 96 % |
| Anti-Knight Killer Sudoku - XL cages by Phistomefel (on 12. June 2020, 12:17) | 139 | 94 % |
| Border skirmish (battlefield) sudoku by Nylimb (on 7. June 2020, 03:39) | 43 | 99 % |
