(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 | |
|---|---|---|---|
 | Krypto Sandwich Sudoku by Realshaggy (on 30. December 2019, 15:22) | 44 |  90 % |
| Eight Xs (XV sudoku) by Lisztes (on 19. November 2020, 01:00) | 23 | 92 % |
| Spurious Skyscrapers by Yawnus (on 12. March 2023, 13:54) | 22 | 91 % |
| Draft Picks by ViKingPrime (on 11. September 2024, 16:30) | 20 | 99 % |
| Mystery Lines Somedoku by blackjackfitz (on 11. September 2024, 18:29) | 23 | 91 % |
| Rex Parvae by JayForty (on 27. May 2022, 17:48) | 62 | 99 % |
| Get Up on the Hydra's Back! (Chaos Construction) by tesseralis (on 20. August 2022, 10:38) | 37 | 99 % |
| Bluth's by mathpesto (on 21. May 2023, 03:08) | 41 | 96 % |
| Killer Lunchboxes by Undar_Beyond (on 16. June 2020, 16:35) | 50 | 99 % |
| Doppelte Adventssummen 4. Advent by Luigi (on 20. December 2015, 08:04) | 52 | 96 % |
| Rotated Lines Sudoku by brandon_bot (on 8. December 2020, 04:12) | 14 | 93 % |
| Grasshoppers and Horseshoes by antiknight (on 7. March 2022, 23:06) | 12 | 93 % |
| Nurikabe Cousins by Agent (on 22. August 2023, 09:00) | 41 | 98 % |
| Nuts and Bolts the Sequel: Mowing the Lawn by KMD (on 26. March 2024, 00:13) | 12 | 98 % |
| Friendly Mean Thermo by Prof.Dori (on 12. August 2024, 19:21) | 11 | 93 % |
| Nashville by ICHTUES (on 19. June 2022, 06:00) | 71 |  97 % |
| Building Regions in Fog of War: Border Patrol 1 by Jeet Sampat (on 23. March 2024, 17:59) | 34 | 90 % |
| Yin-Yang-Yong by marty_sears (on 13. May 2024, 00:27) | 31 | 94 % |
| Castle Wall Delta #1 (10x10) by Jesper (on 22. May 2021, 17:38) | 51 | 98 % |
| Valve by Lisztes (on 12. June 2021, 01:00) | 29 | 92 % |
