(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 | |
|---|---|---|---|
 | Poison Arrow 2 by FryTheGuy (on 13. May 2021, 04:04) | 19 |  93 % |
| Regional Chess Sums: A Proper Introduction by Nordy (on 24. January 2022, 09:30) | 15 | 95 % |
| Die Kryptos - S05E04: Zelte und Bäume by tuace (on 1. September 2022, 20:22) | 15 | 98 % |
| LM-Quali 2023 Leftover: Hashiwokakero by CJK (on 12. March 2023, 20:23) | 17 | 95 % |
| Crossroads by Knickolas (on 3. April 2023, 13:12) | 32 | 97 % |
| Double Killer Sudoku by clover (on 15. December 2023, 21:57) | 35 | 99 % |
| Adventskalender 2020, Finale - Riesenrundweg by Zzzyxas (on 1. December 2020, 07:00) | 27 | 100 % |
| 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 % |
| Chaos Construction: Sightlines by KNT (on 3. June 2022, 07:40) | 133 | 97 % |
| Nurikabe and Chaos by wooferzfg (on 20. February 2023, 02:53) | 70 | 100 % |
| Araf Killer Sudoku by Phistomefel (on 28. July 2020, 09:00) | 100 | 98 % |
| Loses Kalenderblatt April 2019 (2/2) by April (on 1. April 2019, 12:00) | 24 | 99 % |
| Roller Coaster mit Extras 17 by Uhu (on 9. April 2020, 20:36) | 38 | 98 % |
| 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 % |
| Chaos Construction: Color Mixing by KNT (on 15. May 2022, 17:41) | 39 | 97 % |
| Los Angeles by ICHTUES (on 24. July 2022, 06:00) | 69 | 98 % |
| Sprawl by jovi_al (on 22. September 2022, 20:27) | 24 | 95 % |
| Atlantis by Kafkapharnaum (on 26. May 2023, 23:22) | 25 | 100 % |
