(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 | |
|---|---|---|---|
 | Earthquake in Sudokutown #2 by PrimeWeasel (on 14. January 2021, 17:39) | 29 |  99 % |
| Wichtel 2020 (2): Die Himmelsbahn by wichtel (on 30. March 2021, 22:00) | 29 | 99 % |
| Meidjuluk N=15 by PrimeWeasel (on 29. September 2023, 16:16) | 32 | 100 % |
| Public Secrecy by shadow-nexus (on 13. January 2024, 00:54) | 34 | 93 % |
| A puzzle for SXH by psninn (on 21. December 2024, 04:02) | 70 | 96 % |
| Quivering quiver by NicoD (on 3. June 2025, 05:30) | 38 | 90 % |
| A Matt-er Of Time by KwellTheFwell (on 22. September 2025, 21:18) | 38 | 92 % |
| Hot or Pointy? by Niverio (on 12. September 2022, 17:31) | 69 | 99 % |
| to the minimal great hidden by aqjhs (on 30. December 2024, 01:23) | 86 | 93 % |
| Chaos Circles (Updated) by SenatorGronk (on 10. October 2023, 19:54) | 116 | 97 % |
| Across Roads (Deconstruction) by Sotehr (on 6. January 2025, 19:55) | 112 | 98 % |
| Adventsportale, Teil 3 by pirx (on 16. December 2018, 12:00) | 37 | 98 % |
| 38 (HBD Zetamath!) by Qodec (on 9. January 2022, 14:14) | 37 | 95 % |
| X-Sumaguni Sudoku by rockratzero (on 15. April 2023, 08:22) | 36 | 95 % |
| Tricky-Tracky by Sumanta(ANU) (on 9. December 2023, 09:45) | 46 | 95 % |
| Whispers of Doom 3 by NurglesGift (on 15. November 2025, 11:27) | 98 | 97 % |
| Cornerstones by Jagga (on 26. November 2022, 09:06) | 41 | 98 % |
| Halcyon by NicoD (on 27. December 2025, 05:30) | 48 | 98 % |
| Misty Mountain Hop by kuraban (on 12. March 2024, 20:59) | 58 | 94 % |
| Wichtel 2011 (2): Ein Sack voller Flöhe by wichtel (on 12. January 2012, 09:00) | 57 | 98 % |
