(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 | |
|---|---|---|---|
 | Challah by pieguy (on 10. November 2023, 03:30) | 43 |  91 % |
| Anticlockwise by juggler (on 22. December 2024, 22:58) | 40 | 97 % |
| Gigglywhirl (Nabner Whisper) by tallcat (on 4. January 2025, 16:08) | 64 | 95 % |
| Kombisudoku: Chaos - Pünktchen by Richard (on 11. January 2009, 20:28) | 123 | 93 % |
| Sudoku-GP Leftover (1): Liar-X-Sums by JonaS2010 (on 27. October 2020, 17:43) | 36 | 98 % |
| Wrapping Paper on Boxing Day by twototenth (on 28. December 2021, 08:00) | 32 | 97 % |
| Chaos Construction: Vision by KNT (on 31. March 2022, 00:50) | 211 | 98 % |
| Dr. Sudoku by Hecspeed (on 9. September 2022, 08:28) | 27 | 98 % |
| Zeta and Kappa by twototenth (on 18. October 2022, 08:00) | 33 | 96 % |
| U-Bahn unter Hochhäusern (Teil 4) by Zzzyxas (on 31. March 2012, 16:17) | 75 | 96 % |
| Little Antiking Killer by PrimeWeasel (on 10. November 2020, 15:58) | 23 | 97 % |
| Two Wheeler by gtkrouwel (on 29. October 2021, 12:29) | 25 | 94 % |
| Cyclic Generators by SirSchmoopy (on 9. August 2022, 22:17) | 22 | 91 % |
| Winded Arrows (Irregular Sudoku) by Aaronomys (on 22. August 2022, 05:18) | 19 | 99 % |
| Time Twister (Killer/Entropic Lines) by Tyrgannus (on 31. August 2022, 23:15) | 44 | 95 % |
| Arrows And Renban Lines by Jeet Sampat (on 11. November 2022, 00:32) | 43 | 96 % |
| Lace Agate by Niverio (on 4. June 2023, 09:56) | 129 | 95 % |
| Roller Coaster by igniteice (on 29. November 2023, 05:58) | 23 | 91 % |
| 10 out of 10 by burgermason (on 8. December 2024, 10:00) | 24 | 91 % |
| Pune by MavericksJD (on 30. March 2023, 12:51) | 102 | 98 % |
