(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 | |
|---|---|---|---|
 | Fujiyama by Myxo (on 14. December 2022, 14:24) | 28 |  99 % |
| Japanese Sums Nurikabe Arrows (9x9) by Xendari (on 1. January 2023, 08:55) | 14 | 96 % |
| Build Your Own Nuri-Maze #2: Oddsweeper Square by Myxo (on 26. January 2024, 20:13) | 15 | 92 % |
| Sea Level Rise Sudoku by MagnusJosefsson (on 31. March 2024, 18:58) | 14 | 98 % |
| Thirteen Ghosts by mathpesto (on 19. September 2024, 22:37) | 32 | 99 % |
| Ginnels & Snickets (Between Skyscraper) by tallcat (on 29. September 2022, 19:22) | 50 | 98 % |
| Rätselhausen - cinque relazioni by Statistica (on 1. December 2017, 23:55) | 34 | 97 % |
| Palindrome Killer Sudoku by udukos (on 8. August 2020, 23:02) | 37 | 95 % |
| Squares and Circles by Burning Curtains (on 15. August 2021, 20:17) | 33 | 97 % |
| Réaltraí (Pentominous spiral galaxies/Fillomino) by dumediat (on 27. January 2024, 20:19) | 36 | 100 % |
| Entropy X-Sums by Mad-Tyas (on 30. January 2024, 10:12) | 56 | 93 % |
| Thermo Arrow Sudoku by Phistomefel (on 24. May 2021, 04:16) | 88 | 96 % |
| Min-Max-Sichtblöcke (3) by BFaw (on 14. December 2016, 10:00) | 18 | 95 % |
| Wichtel 2017 (4): Drei Wichtel und 144 Häuser by wichtel (on 26. May 2018, 07:04) | 36 | 99 % |
| Unique Values by Mesmer (on 25. January 2021, 12:20) | 55 | 98 % |
| Eternal Life by Sktx (on 20. May 2021, 12:35) | 17 | 100 % |
| Witchcraft by PotatoHead21 (on 25. November 2021, 21:56) | 35 | 97 % |
| Sirius by jovi_al (on 19. February 2022, 03:07) | 36 | 98 % |
| Imaginary Cages by brandon_bot (on 1. May 2022, 21:14) | 21 | 97 % |
| Caudal Autotomy by DadJokes (on 19. August 2022, 21:11) | 24 | 97 % |
