(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 | |
|---|---|---|---|
 | Torn Apart by Black_Doom (on 18. August 2024, 11:58) | 50 |  96 % |
| Roman Architecture by Scruffamudda (on 15. October 2024, 06:42) | 23 | 94 % |
| Region Sum Lines Sudoku by Qodec (on 14. January 2022, 20:20) | 111 | 97 % |
| Copycat Confusion by Phistomefel (on 19. August 2024, 18:03) | 81 | 94 % |
| Color Palette by Joseph nehme (on 18. December 2022, 10:14) | 124 | 96 % |
| Wichtel 2011 (2): Ein Sack voller Flöhe by wichtel (on 12. January 2012, 09:00) | 54 | 98 % |
| Quadrupelblock für Gabi by pin7guin (on 9. July 2015, 21:56) | 48 | 96 % |
| Consecutiveness by Niverio (on 1. August 2021, 11:47) | 51 | 95 % |
| TLDR by Abdul the Killer (on 28. May 2024, 12:34) | 108 | 94 % |
| Six-pack Linked Sudokus #2 by Genomico (on 4. October 2020, 16:49) | 52 | 98 % |
| Pencil puzzle sudoku hybrid series #2 - Hashiwokakero sudoku by Aspartagcus (on 6. November 2020, 11:25) | 52 | 97 % |
| This and That by CaptZebraCakes (on 17. June 2023, 17:54) | 57 | 98 % |
| Misty Mountain Hop by kuraban (on 12. March 2024, 20:59) | 54 | 94 % |
| Killer Sudoku by abed hawila (on 30. March 2021, 12:58) | 43 | 93 % |
| Memory Loss by Joseph nehme (on 25. December 2021, 10:45) | 39 | 92 % |
| 2-knight by fritzdis (on 21. March 2022, 20:40) | 44 | 90 % |
| Very old burger (German Whisper + Kropki + Antiknight Sudoku) by Sktx (on 17. September 2022, 16:50) | 50 | 95 % |
| Manifold by Oddlyeven (on 28. April 2024, 15:43) | 43 | 96 % |
| Killers in the house by Joseph nehme (on 12. September 2020, 07:56) | 43 | 92 % |
| XV Kropki Sudoku by Phistomefel (on 26. September 2020, 15:33) | 115 | 90 % |
