(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 | |
|---|---|---|---|
 | Lunch box by Qodec (on 18. August 2020, 11:18) | 33 |  97 % |
| Mysterious Boxes by fjam (on 8. January 2023, 16:19) | 26 | 91 % |
| Aquarium Fillomino by wooferzfg (on 4. September 2023, 19:58) | 28 | 100 % |
| Redshift by ThePedallingPianist (on 6. September 2025, 22:05) | 31 | 99 % |
| thinking in square rooms by aqjhs (on 14. January 2026, 00:06) | 30 | 100 % |
| 10-in-9 Killer Sudoku by KNT (on 10. May 2022, 01:14) | 48 | 97 % |
| 2T1L by ICHTUES (on 11. September 2022, 06:00) | 70 | 96 % |
| Wichtel 2015 (12 und Schluss): Hommage an eine Künstlerin by wichtel (on 18. July 2016, 21:50) | 34 | 96 % |
| Suguru Chaos Deconstruction: Anti Equites by crispy16 (on 14. May 2022, 02:25) | 66 | 99 % |
| 3D2Y by udukos (on 9. November 2024, 20:45) | 40 | 97 % |
| Caudal Autotomy by DadJokes (on 19. August 2022, 21:11) | 28 | 97 % |
| Cave Express (Japanese Sums Cipher) by Agent (on 21. February 2023, 09:00) | 58 | 100 % |
| Extraterrestrial Tripleblock with X-Sums by KNT (on 27. May 2023, 16:45) | 39 | 100 % |
| Matter by ThePedallingPianist (on 12. August 2023, 00:38) | 24 | 92 % |
| Faultline (Filloku #4) by mormagli (on 12. October 2023, 20:15) | 40 | 97 % |
| RedivideR by goodcity (on 17. March 2024, 16:36) | 21 | 93 % |
| Team Sum Sudoku by Phistomefel (on 7. May 2024, 19:32) | 93 | 97 % |
| Position Sums mit Average Arrows by glum_hippo (on 27. December 2024, 16:59) | 18 | 92 % |
| Skygangers by bodemeister (on 26. July 2025, 02:42) | 19 | 96 % |
| Induction (Nonconsecutive German Whispers Sudoku) by Phistomefel (on 14. June 2022, 09:05) | 141 | 96 % |
