(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 | |
|---|---|---|---|
 | Stranger in a Strange Land by Wuschel (on 24. February 2025, 10:58) | 149 |  99 % |
| Foursquare by NicoD (on 6. May 2025, 05:30) | 53 | 95 % |
| The Thing by mathpesto (on 16. October 2022, 04:48) | 53 | 91 % |
| OutsideTheUsula by Palfly Kampling (on 4. July 2023, 01:47) | 53 | 91 % |
| 1918 by starwarigami (on 19. October 2023, 11:29) | 57 | 96 % |
| Colours in the (k)night XII by Villse (on 14. September 2025, 16:57) | 135 | 96 % |
| Infancy by Myxo (on 14. November 2022, 14:27) | 117 | 97 % |
| VvVwVvV by NicoD (on 15. July 2025, 05:30) | 79 | 94 % |
| Galaxies Collide by Prof.Dori (on 3. April 2024, 15:31) | 84 | 98 % |
| Counterpoint (Renban Arrow) by tallcat (on 16. July 2022, 08:30) | 91 | 97 % |
| Prison Break by Myxo (on 9. July 2023, 11:51) | 109 | 97 % |
| Nine Lives by ThePedallingPianist (on 12. May 2025, 14:40) | 129 | 96 % |
| Chaotic X-Sums by Florian Wortmann (on 6. September 2023, 18:09) | 126 | 97 % |
| Parroty Lines by marty_sears (on 29. April 2024, 13:52) | 183 | 96 % |
| Milchstraße (Sektor 23C) by usp (on 5. November 2014, 00:00) | 40 | 95 % |
| Entwined Sandwiches Sudoku by matt383 (on 7. April 2020, 17:25) | 44 | 97 % |
| ZIRKUS - buntes Buchstabenrätsel / colorful letter puzzle by DocLogic (on 30. April 2020, 22:59) | 33 | 98 % |
| Skyscraper Aquarium Sudoku by Sam Knott (on 23. June 2020, 18:01) | 32 | 96 % |
| 10-in-9 CLXVI sudoku by Nylimb (on 21. October 2020, 20:10) | 15 | 94 % |
| Disjoint Killer Arrows by Joseph nehme (on 13. December 2020, 17:11) | 30 | 96 % |
