(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 | |
|---|---|---|---|
 | Ausgrabungen in Limcastregos by Luigi (on 25. August 2017, 11:43) | 26 |  92 % |
| Carry the Three (two-digit arrow sudoku) by clover (on 30. October 2020, 18:10) | 27 | 98 % |
| Wichtel 2021 (8): Ideenklau im Sparmodus by wichtel (on 17. October 2022, 12:02) | 24 | 100 % |
| 6 Puzzles, 6 Modifiers, 6 Digits by tesseralis (on 15. October 2022, 10:31) | 26 | 96 % |
| Locomotive by wooferzfg (on 20. July 2023, 20:28) | 28 | 100 % |
| Verzwicktes ABCtje by ibag (on 23. October 2011, 09:42) | 21 | 93 % |
| Parity Party X - "Sir Launcelot" by glum_hippo (on 7. June 2020, 06:52) | 19 | 91 % |
| Quantum X by starwarigami (on 16. January 2022, 12:01) | 20 | 99 % |
| Chaotically Coordinated Arrows by Piatato (on 3. March 2022, 19:58) | 58 | 98 % |
| Wichtel 2021 (6): Flucht durch die Unterwelt by wichtel (on 24. September 2022, 02:21) | 17 | 99 % |
| Yin-Yang Compass Fillomino by MagnusJosefsson (on 13. October 2022, 14:59) | 38 | 100 % |
| The Entropy Safe by Mad-Tyas (on 13. February 2023, 07:58) | 43 | 96 % |
| Killocator: Dead or Alive by starwarigami (on 28. February 2024, 10:17) | 20 | 91 % |
| Taijitu (ft. KNT) by TotallyNormalCat (on 26. May 2022, 18:00) | 52 | 97 % |
| Rivers and Islands Sudoku #2 (hard) by matt383 (on 27. May 2020, 14:12) | 37 | 96 % |
| Crypto Japanese Cave with Three Extraterrestrials by KNT (on 21. February 2023, 04:18) | 31 | 100 % |
| Fahrenheit's Vision by Xenonetix (on 11. July 2022, 22:22) | 45 | 99 % |
| Crypto Japanese Cave with Indexers by KNT (on 20. October 2022, 06:39) | 56 | 100 % |
| Roller Coaster mit Extras 14 by Uhu (on 28. May 2019, 23:14) | 39 | 98 % |
| KIIIocator: Ultimate Kill by starwarigami (on 11. November 2021, 03:16) | 14 | 91 % |
