(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 | |
|---|---|---|---|
 | Killomino Sudoku by Phistomefel (on 10. June 2021, 03:54) | 93 |  99 % |
| Medieval Upheaval 4 by Nordy (on 24. June 2024, 08:00) | 87 | 97 % |
| Parity Party X - "Sir Launcelot" by glum_hippo (on 7. June 2020, 06:52) | 23 | 92 % |
| Spiral Galaxy Sudoku with clues by PrimeWeasel (on 13. November 2021, 16:55) | 20 | 97 % |
| Binary Quantum Void by DadJokes (on 13. October 2022, 19:14) | 26 | 94 % |
| Chaconopia: Intro 9x9 (Chaos Construction) by Mad-Tyas (on 12. August 2025, 13:54) | 23 | 100 % |
| Assigned Pentominoes Loop #1 (14x18) by Playmaker6174 (on 11. February 2026, 14:00) | 23 | 99 % |
| Chaotic Skyscraper Sums by Florian Wortmann (on 6. August 2022, 16:04) | 87 | 98 % |
| Knights Mate by blackjackfitz (on 17. January 2024, 20:52) | 46 | 95 % |
| Blackadder by udukos (on 30. May 2022, 12:14) | 54 | 97 % |
| Chaos Construction with Slitherlink clues #2 by Phistomefel (on 21. September 2020, 19:41) | 70 | 98 % |
| 4D Arrow Sudoku by FryTheGuy (on 6. July 2021, 11:20) | 16 | 98 % |
| Three-legged Dog by Abdul the Killer (on 9. November 2022, 19:45) | 53 | 92 % |
| Ein Geburtstagsgruß von Wachtel, Wechtel, Wochtel und Wuchtel by ibag (on 27. March 2023, 20:00) | 14 | 98 % |
| BYO Arrows by Celery (on 28. October 2023, 22:44) | 38 | 91 % |
| Build Your Own Nuri-Maze #3: Crossing Slitherlink by Myxo (on 22. February 2024, 14:43) | 20 | 96 % |
| Beyond the Antihorizon (Black Hole) by heliopolix (on 7. March 2025, 18:04) | 17 | 98 % |
| Why-Why? by SennyK (on 22. November 2025, 17:15) | 20 | 96 % |
| Icewalk Sudoku by KNT (on 28. January 2026, 10:08) | 18 | 98 % |
| Top Right Boi by DubiousMobius (on 21. June 2025, 12:00) | 64 | 100 % |
