(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 | |
|---|---|---|---|
 | Cada oveja con su pareja by sujoyku (on 3. July 2024, 19:46) | 30 |  95 % |
| Widdershins by kuraban (on 25. August 2024, 13:01) | 18 | 94 % |
| Loop Count by arbitrary (on 19. September 2024, 21:23) | 47 | 95 % |
| Blue, white and black 2.0 by Visumation (on 18. October 2024, 11:52) | 33 | 94 % |
| Parity Principle by Andrewsarchus (on 19. April 2025, 08:28) | 32 | 92 % |
| Colorful Squares and Lines by Md88keys (on 18. June 2025, 20:30) | 36 | 91 % |
| Blueshift by ralphwaldo1 (on 6. September 2025, 22:05) | 18 | 92 % |
| One arrow comes to the rescue (Anti-Knight Shading) by galium_odoratum (on 2. December 2025, 20:03) | 17 | 96 % |
| Sandwiched XV Squishmates by SennyK (on 30. December 2025, 23:19) | 19 | 91 % |
| 3 Linked Sudokus by JonaS2010 (on 12. May 2019, 17:24) | 70 | 94 % |
| Two Sides of a Domino by TotallyNormalCat (on 30. June 2021, 20:30) | 55 | 91 % |
| Lost by Joseph nehme (on 24. June 2022, 19:30) | 59 | 96 % |
| Gimme Shelter by glum_hippo (on 29. November 2024, 23:01) | 58 | 96 % |
| Residuum by NicoD (on 2. September 2025, 05:30) | 63 | 97 % |
| 10-in-9 killer sudoku #2 by Nylimb (on 30. January 2020, 12:36) | 42 | 96 % |
| Roller Coaster mit Extras 20 by Uhu (on 13. April 2021, 09:31) | 39 | 99 % |
| Battle With The Archers 12: Silent Threat by Playmaker6174 (on 21. August 2021, 17:17) | 44 | 95 % |
| Battle With The Archers 35: The Conflict of Three Worlds by Playmaker6174 (on 8. September 2022, 03:57) | 48 | 96 % |
| Silk Road (Aquarium Country Road Fillomino) by Agent (on 7. February 2023, 09:00) | 42 | 100 % |
| Habitat 67 by sfushidahardy (on 15. October 2024, 18:35) | 73 | 97 % |
