(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 | |
|---|---|---|---|
 | AUTO - Buchstabenrätsel / Letter Puzzle by DocLogic (on 2. June 2025, 16:52) | 26 |  94 % |
| Up to Nosferatu (with ChinStrap) by sujoyku (on 31. October 2025, 10:00) | 25 | 99 % |
| Across Roads (Deconstruction) by Sotehr (on 6. January 2025, 19:55) | 113 | 98 % |
| June Pentomino Month (3) - Filled Liar Loop by Richard (on 21. June 2013, 12:00) | 54 | 97 % |
| Everything is Stavros96 (Palindrome Killer) by Stavros96 (on 14. January 2021, 07:51) | 63 | 98 % |
| Baltimore by ICHTUES (on 2. January 2022, 06:00) | 60 | 96 % |
| Sudoku Variants Series (278) - Position Sums Sudoku by Richard (on 22. July 2020, 00:00) | 121 | 99 % |
| 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 % |
| 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 % |
| Absolute Chaos by Fenners (on 8. April 2025, 12:47) | 109 | 96 % |
| 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 % |
| 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 % |
| Cornerstones by Jagga (on 26. November 2022, 09:06) | 41 | 98 % |
| Misty Mountain Hop by kuraban (on 12. March 2024, 20:59) | 58 | 94 % |
