(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 | |
|---|---|---|---|
 | Rings Around The Rosy Sudoku by RockyRoer (on 12. August 2020, 16:59) | 46 |  96 % |
| The Cross by Lisztes (on 21. March 2021, 01:00) | 14 | 96 % |
| Alles Gute, Mody! by ibag (on 20. April 2021, 00:00) | 13 | 96 % |
| Not Between Sudoku by stephane.bura (on 29. May 2021, 04:07) | 12 | 98 % |
| Laser ohne Innenhinweise by Uhu (on 31. May 2021, 19:48) | 14 | 98 % |
| Brutalism (Killer Sudoku X) by PulverizingPancake (on 25. June 2021, 21:23) | 65 | 92 % |
| Dalek's Dilemma by apiyo (on 20. August 2021, 04:51) | 15 | 96 % |
| Whirlpool Around 5 by Cane_Puzzles (on 21. November 2021, 08:32) | 15 | 94 % |
| Killer Sudoku: Mutated Fish by Playmaker6174 (on 20. February 2022, 11:52) | 53 | 97 % |
| Impossible Rope Trick? by Skunkworks (on 9. May 2022, 17:18) | 19 | 94 % |
| Sudoku Variants Series (371) - Sudoku Hangover by Richard (on 18. May 2022, 01:00) | 61 | 96 % |
| Liar Fillomino by KNT (on 16. June 2022, 03:40) | 40 | 99 % |
| Archery Range by grkles (on 12. July 2022, 17:05) | 40 | 92 % |
| Unbound by twototenth (on 23. August 2022, 08:00) | 33 | 93 % |
| Super Smashboy by mathpesto (on 24. August 2022, 05:07) | 65 | 96 % |
| -X Sums by JeremyDover (on 5. October 2022, 23:23) | 14 | 98 % |
| Floppy Disks by ViKingPrime (on 14. April 2023, 09:15) | 13 | 94 % |
| 10:01 AM by CaptZebraCakes (on 10. November 2023, 00:30) | 65 | 96 % |
| Ouroboroi (Quadruples Sudoku) by clover (on 5. December 2023, 08:05) | 86 | 94 % |
| Prime Viking by heliopolix (on 21. February 2024, 13:55) | 14 | 96 % |
