(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 | |
|---|---|---|---|
 | 159 German Whispers Sudoku by Qodec (on 19. November 2021, 18:19) | 96 |  97 % |
| Chaos Construction: Akari by Niverio (on 25. June 2022, 21:28) | 45 | 98 % |
| Thermal Nights by abed hawila (on 24. April 2021, 20:29) | 164 | 98 % |
| Skyscrapers Sudoku by Qodec (on 11. December 2021, 11:33) | 61 | 95 % |
| Scientific Method (Killer) by tallcat (on 5. March 2022, 04:46) | 83 | 97 % |
| Steckkisten (3) by BFaw (on 25. August 2013, 14:00) | 19 | 90 % |
| Broken Ring by Lizzy01 (on 10. January 2021, 20:15) | 24 | 93 % |
| Carpet Sudoku III: Cleopatra's Tryst by jackisaacbryan (on 26. September 2020, 22:49) | 21 | 98 % |
| Amnesia by Dave252 (on 3. August 2021, 16:37) | 19 | 98 % |
| Star Nurikabe #47 by BenceJoful (on 31. August 2021, 18:04) | 39 | 98 % |
| (1)59.(4) by twototenth (on 31. May 2022, 08:00) | 35 | 96 % |
| Jaguar's Paw (irregular 6x6) by Samish (on 23. July 2022, 10:10) | 20 | 95 % |
| The Fool's Windmill by Fool on Hill (on 15. August 2022, 18:46) | 20 | 95 % |
| Entropic Tiles by crispy16 (on 3. September 2022, 22:58) | 23 | 97 % |
| Snakomino [Level #1] by Christounet (on 1. February 2023, 22:17) | 57 | 100 % |
| Squeeze by JamesCullum (on 6. March 2023, 23:36) | 22 | 100 % |
| Masyudoku - Sudoku / Masyu Hybrid by Mr.Menace (on 2. November 2022, 21:14) | 61 | 98 % |
| Sashigane Whispers by yttrio (on 15. March 2024, 19:40) | 109 | 98 % |
| Fish food by Qodec (on 4. December 2020, 23:21) | 47 | 97 % |
| Broken Cello by Tyrgannus (on 9. October 2021, 21:02) | 47 | 93 % |
