(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 | |
|---|---|---|---|
 | Oil, Water and Soap by ViKingPrime (on 30. July 2024, 00:00) | 21 |  94 % |
| Staggered by the_cogito (on 26. November 2021, 03:31) | 54 | 97 % |
| Sompeo (Encaged Whispers) by ICHTUES (on 31. July 2022, 06:00) | 64 | 94 % |
| Squares of Parity Sudoku by Richard (on 21. December 2022, 06:00) | 55 | 95 % |
| Wrinkled potato by Quiriqui (on 28. April 2023, 12:48) | 61 | 93 % |
| Battle of Evermore by kuraban (on 17. February 2024, 03:03) | 146 | 96 % |
| Roller Coaster mit Extras 4 by Uhu (on 22. February 2018, 09:27) | 64 | 100 % |
| Anti-Springer Killer, "Postkarte vom Mars" by glum_hippo (on 3. November 2021, 02:16) | 35 | 90 % |
| Empire State of Mind (Numbered Rooms Skyscraper) by tallcat (on 12. May 2023, 09:00) | 70 | 94 % |
| Memento Regem by LeaVulpina (on 10. March 2024, 00:23) | 34 | 93 % |
| Sett Theory by marty_sears (on 11. August 2024, 20:47) | 87 | 97 % |
| Wichtel 2018 (5): Japanische U-Bahn by wichtel (on 29. November 2019, 02:18) | 41 | 99 % |
| Sandwiches for Table Four by RockyRoer (on 22. March 2023, 10:25) | 60 | 96 % |
| Sumthing by ThePedallingPianist (on 7. December 2023, 07:33) | 65 | 95 % |
| Balancing Act (AnalyticalNinja+Palpot collaboration) by AnalyticalNinja (on 29. October 2024, 15:17) | 59 | 97 % |
| Viper in the fog by Jolly Rogers (on 15. June 2024, 10:00) | 115 | 94 % |
| Gebietsprodukte mit Null (III v. III) by Luigi (on 29. April 2010, 17:48) | 48 | 94 % |
| Wichtelkalender 2014 - Monat Oktober by r45 (on 1. October 2014, 00:00) | 51 | 99 % |
| Differenz X Kakuro IV (kryptisch) by tuace (on 31. August 2014, 21:30) | 39 | 97 % |
| Murder on the Orient Express - killer sudoku by KevinCelis (on 18. July 2020, 00:07) | 14 | 95 % |
