(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 | |
|---|---|---|---|
 | Loses Kalenderblatt April 2020 by April (on 1. April 2020, 00:00) | 17 |  100 % |
| Fat X Little Killer Sudoku by Aspartagcus (on 31. August 2020, 10:20) | 21 | 95 % |
| Slingshot Fillomino by Jesper (on 15. September 2020, 08:38) | 30 | 98 % |
| Arrow Sudoku - The Nightmare by emmettcito (on 19. January 2021, 20:36) | 23 | 97 % |
| Taco Bowl 3 - Ring Of Fire by DiMono (on 19. March 2021, 16:15) | 38 | 100 % |
| Parity Party XXV, "Gray's Anatomy" by glum_hippo (on 29. December 2022, 03:46) | 16 | 95 % |
| Fill Rank Fullomino by Myxo (on 31. May 2023, 13:26) | 35 | 97 % |
| Manhattan by wooferzfg (on 17. August 2023, 02:49) | 17 | 98 % |
| Confetti by Ennead (on 17. September 2023, 16:38) | 20 | 100 % |
| Roller Coaster mit Extras 16 by Uhu (on 5. March 2020, 07:34) | 27 | 99 % |
| Bubble Trouble by Stavros96 (on 16. March 2021, 12:01) | 27 | 98 % |
| Lighthouses Nurikabe #2 by KNT (on 12. January 2023, 01:08) | 25 | 100 % |
| Knapp daneben Twin Killer II by Richard (on 1. January 2010, 12:00) | 36 | 94 % |
| Obvious Killer by filuta (on 29. March 2021, 11:31) | 16 | 98 % |
| Castle Wall Delta #2 (15x15) by Jesper (on 1. June 2021, 08:38) | 30 | 100 % |
| Ninelives [X-Sums Chaos Construction] by Panthera (on 22. June 2021, 19:30) | 16 | 100 % |
| Watchtower sudoku by Lizzy01 (on 1. August 2022, 10:24) | 19 | 95 % |
| Loop Nurikabe by wooferzfg (on 2. February 2023, 16:31) | 32 | 100 % |
| Overlarge by Jay Dyer (on 1. May 2023, 14:40) | 56 | 98 % |
| Fillomino Chaos Construction #2 by dennischen (on 7. June 2023, 18:15) | 39 | 98 % |
