(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 | |
|---|---|---|---|
 | Benefactors by Andrewsarchus (on 10. September 2022, 07:31) | 18 |  98 % |
| Disam Bonkers by ICHTUES (on 1. January 2023, 06:00) | 19 | 97 % |
| Geometry Experiment 2 by Jeet Sampat (on 5. March 2023, 14:25) | 22 | 90 % |
| Origin (Coordinate arrows/Negators) by dumediat (on 21. October 2023, 16:10) | 18 | 100 % |
| Remote Chaos by XeonRisq (on 4. January 2024, 19:00) | 18 | 95 % |
| Aqropolis [Aqre Loop Japanese Sums Deconstruction] by Christounet (on 14. May 2024, 00:43) | 19 | 98 % |
| Constance by lerroyy (on 17. May 2024, 11:20) | 21 | 100 % |
| Arrow Laboratory by PotatoHead21 (on 20. January 2023, 15:12) | 27 | 96 % |
| Matroschka, grosse Version by pirx (on 5. February 2016, 18:00) | 43 | 97 % |
| Chaos II: The Two Killers by lerroyy (on 18. April 2022, 22:25) | 48 | 98 % |
| Vault Construction by the_cogito (on 12. July 2022, 16:43) | 54 | 98 % |
| Locust [Kropki Killer Sudoku] by Panthera (on 12. December 2020, 13:00) | 30 | 92 % |
| Sudon'tku by IsaacR (on 19. November 2021, 06:52) | 27 | 91 % |
| Elementary by Christounet (on 18. September 2023, 22:30) | 50 | 98 % |
| The 12 Pentominoes of Christmas (Chaos) by DadJokes (on 8. January 2024, 15:19) | 25 | 100 % |
| Cave 20x20 by Strosahl (on 8. December 2020, 20:54) | 32 | 97 % |
| Santa Puzzle - for dumediat by the_cogito (on 9. January 2023, 18:01) | 29 | 95 % |
| Nurimisaki Killer by Jay Dyer (on 27. March 2023, 18:51) | 56 | 98 % |
| Ten Knights by FryTheGuy (on 20. August 2021, 08:16) | 126 | 97 % |
| Biagonal Bichael (Chaos Construction) by purpl (on 29. May 2022, 17:32) | 33 | 98 % |
