(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 | |
|---|---|---|---|
 | Obstructed View by jwsinclair (on 5. September 2022, 19:17) | 25 |  92 % |
| Build Your Own Killer: The Empty Box by Playmaker6174 (on 18. November 2022, 18:52) | 23 | 100 % |
| Go Kart Race by zegres (on 12. September 2023, 08:19) | 45 | 91 % |
| Black and White Cookie by pieguy (on 16. September 2023, 02:41) | 60 | 93 % |
| The Train and the Fly by marty_sears (on 16. August 2024, 11:13) | 69 | 95 % |
| Disjoint 258 Sudoku by Qodec (on 8. October 2021, 18:05) | 58 | 95 % |
| Sudoku Variants Series (177) - Frameless Sudoku by Richard (on 18. April 2017, 00:00) | 93 | 92 % |
| That's Sum Slithering by andreasv (on 16. April 2022, 08:56) | 38 | 97 % |
| Trust Me, I'm Lying by Chefofdeath (on 23. June 2022, 02:39) | 34 | 93 % |
| Evolution by grkles (on 10. March 2023, 12:16) | 74 | 91 % |
| Adventskalender 2023, Türchen 24 - Masyukoralle by Zzzyxas (on 24. December 2023, 07:00) | 34 | 99 % |
| Lots of Fun by heliopolix (on 29. May 2024, 20:49) | 29 | 95 % |
| Kerzen 4 by usp (on 26. January 2015, 00:00) | 47 | 94 % |
| Subway Lines (Chaos Sandwich Sudoku) by Agent (on 15. April 2022, 09:00) | 44 | 99 % |
| A puzzle of two halves by arbitrary (on 13. April 2024, 11:32) | 85 | 98 % |
| Obstructed Skyline (fog) by jwsinclair (on 20. August 2023, 18:13) | 121 | 92 % |
| Undec-ided by SirSchmoopy (on 11. April 2022, 00:06) | 70 | 98 % |
| Candy Craze by Niverio (on 5. August 2023, 11:58) | 75 | 96 % |
| Hybridsudoku, „Der kleine Trommler“ by glum_hippo (on 22. December 2020, 20:54) | 47 | 94 % |
| Thermal Killer (frei nach Madmahogany) by glum_hippo (on 6. May 2021, 05:30) | 41 | 92 % |
