(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 | |
|---|---|---|---|
 | Slitherlinked (Permaculture) by the_cogito (on 10. March 2025, 19:34) | 17 |  96 % |
| Chaos Construction: Sightlines by KNT (on 3. June 2022, 07:40) | 129 | 97 % |
| Schrödinger's Triplers by Oddlyeven (on 22. July 2023, 17:44) | 47 | 99 % |
| Building between by Paletron (on 10. August 2023, 20:20) | 59 | 96 % |
| Broken Gift (Partial Irregular Killer Sudoku) by peterchayward (on 16. May 2021, 11:42) | 41 | 92 % |
| Loses Kalenderblatt April 2019 (2/2) by April (on 1. April 2019, 12:00) | 24 | 99 % |
| Sandwich Fillomino #1 - Vicious Circle by Mark Sweep (on 19. March 2021, 10:00) | 14 | 98 % |
| 6556 by abed hawila (on 23. March 2021, 21:07) | 23 | 99 % |
| Interception (Arrow Sudoku) by tallcat (on 1. September 2021, 14:30) | 41 | 95 % |
| Four body problem by filuta (on 21. November 2021, 18:11) | 12 | 93 % |
| Los Angeles by ICHTUES (on 24. July 2022, 06:00) | 68 | 98 % |
| Sprawl by jovi_al (on 22. September 2022, 20:27) | 24 | 95 % |
| Loop with a Coral Infestation by KNT (on 20. August 2023, 20:00) | 28 | 100 % |
| Manhattan by starwarigami (on 10. October 2023, 10:59) | 15 | 95 % |
| Wichtel 2022 (9 und vorläufig Schluss): Die Wichtel in Pental by wichtel (on 1. December 2023, 23:23) | 11 | 98 % |
| ✚ Whisper-me-Sum-thing Loop ✚ by ElChiglia (on 9. December 2023, 07:15) | 31 | 91 % |
| Roundabouts by Black_Doom (on 27. July 2024, 19:36) | 28 | 91 % |
| Wichtels Rätselsommer 2024 (4): Wirrwarr im Garten by wichtel (on 22. August 2024, 20:23) | 11 | 100 % |
| Chaos Construction: Slingshots by Piatato (on 26. January 2025, 00:45) | 70 | 97 % |
| Knight's Whirlpool by SudokuExplorer (on 10. February 2022, 00:30) | 107 | 98 % |
