(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 | |
|---|---|---|---|
 | Headmaster's Toe (Anti-Knight, Renban) by juddimal (on 4. January 2025, 22:23) | 42 |  92 % |
| Throne Room (Sudokuvania boss) by SkepticalMario (on 20. June 2025, 07:07) | 38 | 96 % |
| Concurrence by Oddlyeven (on 31. May 2025, 01:34) | 16 | 93 % |
| Escape Velocity (Arrow/XV) by damo_89 (on 3. June 2025, 22:53) | 60 | 96 % |
| Pretending (with ChinStrap) by MSDOS (on 9. June 2025, 21:56) | 24 | 97 % |
| Chaotic 3D Full Rank by SparkNights (on 23. August 2025, 09:03) | 17 | 98 % |
 | I forget what 8 was for by sanabas (on 13. September 2025, 18:12) | 16 | 100 % |
| Displacement (Arrow Sudoku) by Phistomefel (on 10. May 2022, 19:07) | 101 | 97 % |
| Perfectly Balanced by IcyFruit (on 13. February 2025, 14:33) | 82 | 97 % |
| Tír na nÓg by Qodec (on 17. July 2022, 10:20) | 61 | 98 % |
| Fishnet by TotallyNormalCat (on 22. February 2022, 02:30) | 90 | 97 % |
| Beyond (Nurikabe Sudoku) by MaizeGator (on 15. July 2025, 20:10) | 81 | 97 % |
| Missing Quads by antiknight (on 28. June 2022, 19:05) | 42 | 93 % |
| 6 Arrows by Jeet Sampat (on 25. September 2022, 22:46) | 41 | 97 % |
| Crypto Japanese Cave from the Underworld by KNT (on 30. October 2022, 05:29) | 36 | 99 % |
| Polymorphic Chaos by thoughtbyte (on 22. August 2023, 13:53) | 71 | 98 % |
| Ready For Launch by Niverio (on 7. May 2024, 10:19) | 42 | 95 % |
| Modular Fillomino by mathpesto (on 16. November 2024, 03:08) | 100 | 98 % |
| Eine Koralle by matter (on 24. May 2015, 08:51) | 28 | 93 % |
| Extreme Lunchbox by Undar_Beyond (on 15. May 2020, 20:32) | 32 | 90 % |
