(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 | |
|---|---|---|---|
 | MGC-1326 [Masyu Star Battle] by Christounet (on 17. July 2024, 23:54) | 30 |  95 % |
| Typhon by Kafkapharnaum (on 24. August 2024, 19:41) | 32 | 99 % |
| Medieval Buffet by Manta-Ray (on 16. September 2024, 14:11) | 31 | 95 % |
| grow so natural, i eat my kale by aqjhs (on 17. February 2025, 02:30) | 37 | 99 % |
| Slitherlinked (Permaculture) by the_cogito (on 10. March 2025, 19:34) | 20 | 97 % |
| Lines Lines by SSG (on 17. September 2025, 07:05) | 40 | 93 % |
| Japanische Summen mit Hochhauskern - gründlich daneben by ibag (on 27. March 2014, 00:00) | 58 | 100 % |
| Ei8teen by Joseph nehme (on 13. August 2022, 08:19) | 68 | 99 % |
| Doubler XL by thoughtbyte (on 6. September 2023, 00:07) | 63 | 98 % |
| Renban Circus by JeffWajes (on 2. September 2024, 18:54) | 61 | 95 % |
| MIA by zetamath (on 24. May 2022, 16:03) | 98 | 98 % |
| Zum Geburtstag by Uhu (on 9. July 2017, 00:00) | 42 | 98 % |
| Chained Killer Sudoku by Shinya (on 12. January 2020, 23:22) | 44 | 93 % |
| Nexus by udukos (on 12. June 2021, 01:00) | 46 | 98 % |
| Friendly Indexing Miracle by thoughtbyte (on 5. June 2023, 18:29) | 43 | 95 % |
| Schrodinger's Split Peas by SamuPiano (on 12. July 2024, 15:44) | 43 | 97 % |
| Knight's Whirlpool by SudokuExplorer (on 10. February 2022, 00:30) | 111 | 98 % |
| Round Robin by IcyFruit (on 12. January 2024, 21:24) | 35 | 97 % |
| Colour Wheel (Colourful Killers, Rotational Pairs) by The Book Wyrm (on 18. May 2024, 00:55) | 35 | 95 % |
| Roundabouts by Black_Doom (on 27. July 2024, 19:36) | 36 | 93 % |
