(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 | |
|---|---|---|---|
 | Wichtelkalender 2013 - August by SilBer (on 1. August 2013, 00:00) | 53 |  99 % |
| Wichtel 2019 (4): Unvollendet ausgegraben by wichtel (on 17. August 2020, 20:10) | 25 | 99 % |
| Battle With The Archers 34 - The Climax: The Vow of Three Worlds by Playmaker6174 (on 15. July 2022, 08:06) | 83 | 97 % |
| Chaos in all Regions by Bother__ (on 4. December 2022, 21:29) | 31 | 92 % |
| Arrow Courtyard by PotatoHead21 (on 16. February 2023, 10:33) | 31 | 95 % |
| Thermo Unicorn by NurglesGift (on 6. January 2024, 12:35) | 32 | 92 % |
| Cobra's Curse by IcyFruit (on 1. February 2024, 14:37) | 87 | 97 % |
| Eureka! by juggler (on 3. October 2024, 15:39) | 91 | 97 % |
| Arrow Knight by ademjaz (on 31. December 2022, 11:54) | 77 | 96 % |
| Middle of the Road (Killer) by tallcat (on 13. February 2023, 08:00) | 83 | 97 % |
| pH Anti-Knight Killer Sudoku by udukos (on 18. July 2020, 16:49) | 49 | 94 % |
| Battle With The Archers 21: The Order of Three Worlds by Playmaker6174 (on 19. November 2021, 16:56) | 45 | 98 % |
| 100 by Klvsched (on 14. August 2024, 12:51) | 45 | 94 % |
| Chaos Construction: Bread and Pie by Myxo (on 21. May 2025, 14:39) | 143 | 99 % |
| Steering Wheel (Classic) by SudokuExplorer (on 14. August 2021, 02:00) | 62 | 91 % |
| Nun Gimel Hay Shin - A Chanukah Sudoku by Mojo872 (on 15. December 2022, 06:12) | 60 | 94 % |
| Quagmire by jwsinclair (on 7. February 2023, 20:48) | 75 | 96 % |
| K2 (Anti-diagonal arrow sudoku) by Qodec (on 28. October 2023, 17:22) | 72 | 97 % |
| Anti-Knight Killer Sudoku - XL cages by Phistomefel (on 12. June 2020, 12:17) | 137 | 94 % |
| Three is a Crowd Sudoku by rk1970 (on 22. April 2020, 09:26) | 40 | 95 % |
