(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 | |
|---|---|---|---|
 | Almost Satisfaction by Joseph nehme (on 12. February 2022, 07:15) | 27 |  97 % |
| Double Equals by josh_johnson (on 13. August 2022, 23:59) | 21 | 96 % |
| Palette Paradise by siron2133 (on 2. September 2022, 18:37) | 23 | 97 % |
| The Slightly Irregular Fire Engine by glum_hippo (on 19. February 2023, 05:51) | 24 | 94 % |
| Run For Cover by 99%Sneaky (on 6. June 2023, 23:47) | 26 | 90 % |
| 4 Choose 2 by Prof.Dori (on 28. March 2024, 14:39) | 24 | 97 % |
| Cavino Seguito (Canal View Nonogram) by PrimeWeasel (on 18. April 2024, 09:10) | 46 | 99 % |
| Regional Yajilin Sudoku by Myxo (on 7. December 2024, 12:23) | 45 | 91 % |
| Six in the Fog by oskode (on 29. August 2025, 06:06) | 47 | 93 % |
| X---V*9 by NurglesGift (on 7. September 2025, 15:02) | 76 | 94 % |
| Addierter Neuner in Doppelpack by Richard (on 5. February 2010, 12:00) | 70 | 94 % |
| Runder Rundweg 4 by pwahs (on 8. August 2009, 17:26) | 44 | 95 % |
| Compass Fillomino #2 by MagnusJosefsson (on 8. April 2021, 18:35) | 48 | 97 % |
| Sisyphos Fillomino (10x10) by Jesper (on 14. November 2022, 15:00) | 42 | 100 % |
| What Do Killers Eat? by RockyRoer (on 24. September 2022, 14:44) | 64 | 100 % |
| Dotropy (Entropic sudoku with kropki pairs) by Qodec (on 14. May 2023, 17:30) | 75 | 96 % |
| Hiding Spots by Xendari (on 27. May 2023, 10:21) | 76 | 96 % |
| Illithid by PulverizingPancake (on 15. September 2021, 05:53) | 61 | 97 % |
| Multiplied Cages by RockyRoer (on 2. December 2021, 03:40) | 21 | 93 % |
| Killer XL by Jeet Sampat (on 20. February 2022, 08:33) | 30 | 96 % |
