(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 | |
|---|---|---|---|
 | Detroit by ICHTUES (on 14. November 2021, 06:00) | 46 |  97 % |
| Chaos: Killer by lerroyy (on 11. April 2022, 20:42) | 47 | 97 % |
| MIA by zetamath (on 24. May 2022, 16:03) | 93 | 98 % |
| LM-Quali 2023 Leftover: Hashiwokakero by CJK (on 12. March 2023, 20:23) | 16 | 94 % |
| Proximity (Renban/Antiknight) by dumediat (on 13. May 2023, 14:29) | 68 | 92 % |
| Chaos Construction: Killer Cages by KNT (on 4. April 2022, 23:31) | 121 | 99 % |
| Roller Coaster mit Extras 17 by Uhu (on 9. April 2020, 20:36) | 35 | 99 % |
| The Snake Nest by matt383 (on 9. October 2020, 14:03) | 38 | 98 % |
| The Corners Are Even - Arrow Odd/Even Sudoku by Mr.Menace (on 2. February 2022, 23:04) | 36 | 96 % |
| Build Your Own Killer: Criminal Mind by Playmaker6174 (on 3. March 2022, 18:07) | 38 | 100 % |
| Made to be Broken by jwsinclair (on 23. January 2023, 20:54) | 37 | 96 % |
| Renban Non-con by yttrio (on 21. April 2023, 20:26) | 36 | 95 % |
| Entropy Antimatter by Mad-Tyas (on 5. March 2024, 16:24) | 37 | 93 % |
| Mounting Pressure (Between Lines) by Blashyrkh (on 3. September 2024, 11:57) | 38 | 96 % |
| Araf Killer Sudoku by Phistomefel (on 28. July 2020, 09:00) | 90 | 98 % |
| The Final Fourteen by FryTheGuy (on 20. October 2021, 05:38) | 25 | 96 % |
| Wordless Kakuro by qiuyanzhe (on 26. November 2021, 08:34) | 21 | 92 % |
| Imbalanced Flower by MavericksJD (on 19. June 2022, 21:33) | 29 | 92 % |
| Target Acquired (Equalines Sudoku) by Sktx (on 4. February 2023, 22:17) | 24 | 96 % |
| Negative Space [Meta-Renban Sudoku] by wisty (on 12. April 2023, 10:41) | 20 | 93 % |
