(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 | |
|---|---|---|---|
 | Arrow Knight by ademjaz (on 31. December 2022, 11:54) | 72 |  96 % |
| TEQUILA - Buchstabenrätsel / Letter Puzzle by DocLogic (on 13. January 2024, 15:46) | 29 | 98 % |
| Siphon (Region Sum Lines) by tallcat (on 11. August 2022, 08:00) | 121 | 99 % |
| Metope (Chaos Construction) by tallcat (on 9. December 2023, 08:00) | 119 | 97 % |
| Japanische Summen-Pentominos 2358 by Uhu (on 14. April 2017, 22:48) | 45 | 96 % |
| Japanische Summen-Höhle Prime/Krypto by Uhu (on 10. August 2017, 19:56) | 42 | 99 % |
| Überlappungssudoku II by Richard (on 29. January 2010, 12:00) | 72 | 92 % |
| Battle With The Archers 34 - The Climax: The Vow of Three Worlds by Playmaker6174 (on 15. July 2022, 08:06) | 79 | 97 % |
| Schlingerpfad 000217 by adam001 (on 3. July 2012, 21:25) | 14 | 92 % |
| Killer Raute by tuace (on 12. January 2014, 15:30) | 45 | 98 % |
| WSC-Training: Clueless Hidden Classic by JonaS2010 (on 7. October 2019, 18:33) | 60 | 98 % |
| Japanische Bahnhöfe, Teil 1 by pirx (on 27. May 2020, 13:00) | 29 | 95 % |
| Flying 9s by abed hawila (on 18. December 2020, 19:59) | 18 | 92 % |
| Parity Party XVIII, "Clones" by glum_hippo (on 11. April 2021, 06:00) | 14 | 98 % |
| FARBMISCHUNG - Buchstabenrätsel / Color Mix - letter puzzle by DocLogic (on 28. November 2021, 11:11) | 31 | 97 % |
| Between the Lines (Entropic Lines/Between Lines/Kropki Pairs) by dumediat (on 28. August 2022, 17:43) | 20 | 93 % |
| Lookin' Hot by djorr (on 5. December 2022, 14:00) | 17 | 90 % |
| Killer on the Orient Express by ThePedallingPianist (on 9. December 2022, 19:00) | 49 | 97 % |
| Intersection by ralphwaldo1 (on 3. January 2023, 02:44) | 16 | 96 % |
| Demolition (Numbered Rooms, Skyscraper) by Crusader175 (on 15. January 2023, 15:00) | 17 | 92 % |
