(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 | |
|---|---|---|---|
 | Meidjuluk II (N=25) by glum_hippo (on 1. June 2023, 00:00) | 48 |  99 % |
| Zebediah Killgrave by starwarigami (on 24. November 2023, 10:01) | 72 | 94 % |
| Evil Eyes 4 v. 4 by Luigi (on 17. June 2010, 14:45) | 19 | 97 % |
| Adventskalender 2020, Finale - Riesenrundweg by Zzzyxas (on 1. December 2020, 07:00) | 26 | 100 % |
| Snake Sum Sudoku 5 by Quarterthru (on 11. July 2020, 20:00) | 24 | 97 % |
| Killer Sudoku - Twirl by Phistomefel (on 6. December 2020, 11:18) | 67 | 97 % |
| 真笑Puzzles023--N-Sums Sudoku--Counter by cdwg2000 (on 5. February 2021, 17:45) | 28 | 100 % |
| Interception (Arrow Sudoku) by tallcat (on 1. September 2021, 14:30) | 40 | 95 % |
| Motel (Deconstruction: Numbered Rooms) by purpl (on 8. April 2022, 16:42) | 45 | 98 % |
| Schrödinger Sudkuro by ICHTUES (on 30. October 2022, 06:00) | 47 | 98 % |
| Fillomino Yajilin (10x10) by ns08 (on 8. May 2023, 00:01) | 23 | 95 % |
| Boxed Rooms (Chaos Construction) by thoughtbyte (on 26. August 2023, 13:01) | 58 | 96 % |
| Nothing to see here by fritzdis (on 31. August 2023, 09:36) | 34 | 98 % |
| Arrows (Arrow Sudoku) by LittleNightmaresLady (on 10. November 2023, 18:29) | 28 | 95 % |
| Wichtels Rätselsommer 2024 (3): Diebische Wichtel by wichtel (on 17. August 2024, 20:23) | 16 | 98 % |
| Toei Subway by Myxo (on 19. February 2025, 14:05) | 19 | 100 % |
| Flat Cosmos (Chaos Construction) by sfushidahardy (on 13. August 2024, 23:53) | 70 | 99 % |
| Chained Killer Sudoku by Shinya (on 12. January 2020, 23:22) | 44 | 93 % |
| Killer Sudoku - Dirty Tricks by DiMono (on 25. November 2020, 16:27) | 48 | 97 % |
| The 4-Colour Theorem by starwarigami (on 5. February 2023, 10:00) | 75 | 96 % |
