(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 | |
|---|---|---|---|
 | Coral Creek by Jay Dyer (on 17. June 2023, 01:07) | 50 |  96 % |
| The Answer to the Ultimate Question by ViKingPrime (on 11. October 2024, 20:30) | 100 | 97 % |
| Tag 20 - Shakashaka by CJK (on 11. February 2021, 14:56) | 29 | 95 % |
| Optimization by djorr (on 23. June 2021, 16:10) | 19 | 97 % |
| Double Digit Drama by mormagli (on 21. February 2024, 06:25) | 22 | 99 % |
| Uneasy Alliances by ViKingPrime (on 30. May 2024, 16:00) | 19 | 93 % |
| Mini-Colossal Octoquadri III: Sukoro by sfushidahardy (on 11. June 2025, 17:52) | 31 | 100 % |
| Yin Yang FSOE by flutchman (on 9. November 2025, 10:34) | 92 | 96 % |
| X-Square Whispers by Cane_Puzzles (on 15. May 2022, 17:20) | 35 | 96 % |
| Entropic Pieces by Myxo (on 11. March 2023, 19:35) | 32 | 98 % |
| BAUERNHOF - 3D-Buchstabenrätsel / 3D letter puzzle by DocLogic (on 24. July 2023, 15:15) | 31 | 97 % |
| BYO RSL by mathpesto (on 5. November 2023, 15:55) | 33 | 94 % |
| Mystery Lines Somedoku by blackjackfitz (on 11. September 2024, 18:29) | 35 | 93 % |
| Scalding torrent by NicoD (on 3. August 2025, 05:30) | 35 | 93 % |
| Dislocation by Ali M (on 26. July 2023, 22:58) | 80 | 93 % |
| Angel Fish by Blobz (on 29. July 2024, 16:00) | 51 | 91 % |
| Exclusion (Thermo Renban Sudoku) by Phistomefel (on 27. March 2023, 18:43) | 135 | 98 % |
| Roller Coaster mit Extras 3 by Uhu (on 20. January 2018, 12:49) | 62 | 98 % |
| Min-Max-Sichtblöcke (4) by BFaw (on 14. December 2016, 10:00) | 20 | 94 % |
| Odd River - Prime Whispers Sudoku by ibn Muhyiddin (on 20. July 2020, 14:43) | 20 | 99 % |
