(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 | |
|---|---|---|---|
 | Extreme Lunchbox by Undar_Beyond (on 15. May 2020, 20:32) | 33 |  90 % |
| Skyscrapers 10x10 by pandiani42 (on 6. August 2020, 12:42) | 28 | 93 % |
| Wheel of Fortune by Qodec (on 4. September 2020, 13:34) | 33 | 96 % |
| Adventskalender 2023, Türchen 21 - Lügende Passierscheine by Zzzyxas (on 21. December 2023, 07:00) | 27 | 98 % |
| U-Bahn with Extra Regions by wooferzfg (on 2. July 2024, 07:46) | 27 | 96 % |
| Transfer Right By 2 by vitaminz (on 24. June 2025, 22:25) | 31 | 91 % |
| A Third Loop by mathpesto (on 24. August 2023, 02:34) | 50 | 99 % |
| Tête-á-tête (Between Line Nabner) by tallcat (on 11. September 2023, 08:00) | 53 | 95 % |
| Drainers and Sires by mathpesto (on 23. June 2025, 15:52) | 53 | 96 % |
| Palindrome Killer Sudoku by udukos (on 8. August 2020, 23:02) | 41 | 94 % |
| Rigel (Arrow Sudoku) by emmettcito (on 27. April 2021, 17:01) | 42 | 98 % |
| Antiknight Between Lines by Gliperal (on 12. May 2021, 04:19) | 42 | 97 % |
| Witchcraft by PotatoHead21 (on 25. November 2021, 21:56) | 39 | 98 % |
| 8-Color Theorem by the_cogito (on 14. June 2022, 19:10) | 39 | 98 % |
| Extraterrestrial Tripleblock with X-Sums by KNT (on 27. May 2023, 16:45) | 37 | 100 % |
| Above Average On Average (Geometry Experiment 5) by Jeet Sampat (on 22. July 2023, 17:45) | 37 | 95 % |
| Matter by ThePedallingPianist (on 12. August 2023, 00:38) | 22 | 92 % |
| Build-Your-Own Kropki Sudoku by The Book Wyrm (on 15. January 2024, 20:58) | 52 | 95 % |
| Sorted Subway by KNT (on 22. July 2024, 07:21) | 41 | 96 % |
| Position Sums mit Average Arrows by glum_hippo (on 27. December 2024, 16:59) | 17 | 98 % |
