(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 | |
|---|---|---|---|
 | Crowded Square by jwsinclair (on 3. March 2022, 19:31) | 16 |  96 % |
| Berserk (slow thermo + german whispers sudoku) by Aspartagcus (on 18. March 2022, 21:28) | 21 | 92 % |
| Orb 4: It's All Gone Wrogn! by DiMono (on 14. June 2022, 20:32) | 30 | 99 % |
| Descending Madness 4 (Ambiguous Combination Constraint Arrows) by AnalyticalNinja (on 17. June 2022, 18:45) | 16 | 96 % |
| Wichtel 2021 (3): Erklärnix by wichtel (on 8. July 2022, 12:20) | 16 | 100 % |
| Pentomino Jigsaw by XeonRisq (on 19. October 2022, 03:00) | 15 | 94 % |
| Secrets of Entropy by Mad-Tyas (on 26. December 2022, 03:00) | 47 | 94 % |
| Cross the Sums by abed hawila (on 13. March 2023, 12:56) | 64 | 97 % |
| Stacks of Arrows by PotatoHead21 (on 22. June 2023, 08:26) | 17 | 93 % |
| Arrival by Kafkapharnaum (on 13. October 2023, 02:02) | 17 | 100 % |
| Jungle Japes [Indexing Killer Sudoku] by wisty (on 30. November 2023, 23:00) | 14 | 96 % |
| The devil's modular links by egubachu (on 8. April 2024, 21:58) | 16 | 92 % |
| Godoku by sfushidahardy (on 25. May 2024, 20:28) | 17 | 94 % |
| MENSCH - Buchstabenrätsel / Letter Puzzle by DocLogic (on 12. June 2024, 16:35) | 30 | 96 % |
| Neural Network by Tobias Brixner (on 20. August 2024, 16:35) | 14 | 92 % |
| Modular Mayhem by Toomas_ (on 15. December 2024, 21:57) | 49 | 93 % |
| Calamari by plasmath (on 28. December 2024, 02:00) | 18 | 92 % |
| Impetus by NicoD (on 29. August 2025, 05:30) | 53 | 94 % |
| [PAC] Yin Yang Ewe-Bahn by MaizeGator (on 8. October 2025, 04:00) | 16 | 100 % |
| 10X Lines by Oddlyeven (on 2. November 2025, 18:18) | 28 | 94 % |
