(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) | 30 | 99 % |
| There's Something Off in This Sandwich by RockyRoer (on 8. April 2023, 21:08) | 36 | 99 % |
| 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) | 72 | 96 % |
| A Matt-er Of Time by KwellTheFwell (on 22. September 2025, 21:18) | 38 | 92 % |
| Dutch Flat Mates: Three is a Crowd by Flinty (on 11. February 2026, 07:00) | 32 | 94 % |
| Hot or Pointy? by Niverio (on 12. September 2022, 17:31) | 70 | 99 % |
| Adventsportale, Teil 3 by pirx (on 16. December 2018, 12:00) | 37 | 98 % |
| 38 (HBD Zetamath!) by Qodec (on 9. January 2022, 14:14) | 38 | 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) | 47 | 95 % |
| Split Pea Loup by yttrio (on 21. September 2024, 04:46) | 35 | 92 % |
| new year, who dis? by aqjhs (on 1. January 2025, 00:00) | 46 | 92 % |
| ABC-Box Skyscraper - From A Window by DiMono (on 18. August 2021, 18:58) | 41 | 99 % |
| Cornerstones by Jagga (on 26. November 2022, 09:06) | 41 | 98 % |
| Individuality by arbitrary (on 3. May 2024, 20:58) | 45 | 95 % |
| Some Things Fogn by pdyxs (on 8. February 2025, 04:53) | 58 | 90 % |
| The Pairrow's Surveyors by Andrewsarchus (on 14. January 2026, 06:30) | 49 | 98 % |
| Theseus and the Minotaur by juggler (on 31. May 2025, 10:53) | 52 | 93 % |
