(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 | |
|---|---|---|---|
 | 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 % |
| Steering Wheel (Classic) by SudokuExplorer (on 14. August 2021, 02:00) | 63 | 91 % |
| 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) | 72 | 97 % |
| Anti-Knight Killer Sudoku - XL cages by Phistomefel (on 12. June 2020, 12:17) | 138 | 94 % |
| Border skirmish (battlefield) sudoku by Nylimb (on 7. June 2020, 03:39) | 43 | 99 % |
| The Soused Snake by Big Tiger (on 30. June 2020, 02:23) | 17 | 95 % |
| DSM Qualitraining 2021: Average Arrows by Realshaggy (on 17. January 2021, 06:00) | 40 | 97 % |
| Anti-King Arrow X Killer by ICHTUES (on 21. March 2021, 06:00) | 28 | 94 % |
| Did someone say Mondrian? (Killer) by Chilly (on 2. August 2021, 23:27) | 16 | 91 % |
| Renban/Skyscrapers Sudoku by MagnusJosefsson (on 11. September 2021, 13:47) | 27 | 95 % |
| Baba is Anti-Knight by FryTheGuy (on 16. October 2021, 21:36) | 40 | 97 % |
| Killer Sudoku by PotatoHead21 (on 12. December 2021, 08:36) | 58 | 93 % |
| Pared Down (Parity Arrow) by tallcat (on 22. January 2022, 22:44) | 55 | 92 % |
| SiXteen by djorr (on 22. April 2022, 14:00) | 14 | 95 % |
| Thermos and Cages by Jeet Sampat (on 7. March 2022, 04:31) | 33 | 97 % |
| Knight Sweats by SlowLarry (on 21. August 2022, 16:26) | 34 | 94 % |
| The Demon Watch by Perladel (on 26. August 2022, 14:28) | 28 | 96 % |
