(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 | |
|---|---|---|---|
 | Floppy Disks by ViKingPrime (on 14. April 2023, 09:15) | 13 |  94 % |
| 10:01 AM by CaptZebraCakes (on 10. November 2023, 00:30) | 65 | 96 % |
| Ouroboroi (Quadruples Sudoku) by clover (on 5. December 2023, 08:05) | 86 | 94 % |
| Prime Viking by heliopolix (on 21. February 2024, 13:55) | 14 | 96 % |
| Cada oveja con su pareja by sujoyku (on 3. July 2024, 19:46) | 30 | 95 % |
| Widdershins by kuraban (on 25. August 2024, 13:01) | 18 | 94 % |
| Loop Count by arbitrary (on 19. September 2024, 21:23) | 47 | 95 % |
| Blue, white and black 2.0 by Visumation (on 18. October 2024, 11:52) | 33 | 94 % |
| Parity Principle by Andrewsarchus (on 19. April 2025, 08:28) | 32 | 92 % |
| Colorful Squares and Lines by Md88keys (on 18. June 2025, 20:30) | 36 | 91 % |
| Blueshift by ralphwaldo1 (on 6. September 2025, 22:05) | 18 | 92 % |
| The Reorg by Andrewsarchus (on 19. December 2025, 12:40) | 14 | 100 % |
| JS Whisper Yin Yang by yttrio (on 3. January 2026, 02:10) | 82 | 98 % |
| Recess by oskode (on 9. January 2026, 10:05) | 47 | 90 % |
| 3 Linked Sudokus by JonaS2010 (on 12. May 2019, 17:24) | 70 | 94 % |
| Two Sides of a Domino by TotallyNormalCat (on 30. June 2021, 20:30) | 55 | 91 % |
| Lost by Joseph nehme (on 24. June 2022, 19:30) | 59 | 96 % |
| Gimme Shelter by glum_hippo (on 29. November 2024, 23:01) | 58 | 96 % |
| Residuum by NicoD (on 2. September 2025, 05:30) | 63 | 97 % |
| Calm Construction by oskode (on 16. November 2025, 11:42) | 178 | 97 % |
