(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 | |
|---|---|---|---|
 | Looking Left by Md88keys (on 21. July 2025, 15:00) | 23 |  92 % |
| DSM Qualitraining 2021: Parity Party Sudoku by Realshaggy (on 16. January 2021, 06:00) | 52 | 96 % |
| Median Killer Sudoku by RockyRoer (on 11. June 2021, 14:00) | 51 | 98 % |
| Reban Arrow Sudoku by psninn (on 19. March 2024, 04:55) | 58 | 95 % |
| Twin Killer IV (B) by Richard (on 6. August 2010, 12:00) | 76 | 94 % |
| Magnetschlange 2 (Leftover der LM-Quali 2021) by ibag (on 1. March 2021, 22:22) | 36 | 98 % |
| Attention Deficit Disorder by HalfBakedLunatic (on 10. June 2023, 04:42) | 42 | 90 % |
| Candy Craze by Niverio (on 5. August 2023, 11:58) | 80 | 96 % |
| Crawfish by jwsinclair (on 14. December 2023, 17:21) | 44 | 90 % |
| Self-Help Aisle (with ChinStrap) by mellowrobinson (on 27. June 2025, 15:00) | 42 | 91 % |
| Chiki returns, in... 'Monkey in the Bank' by ViKingPrime (on 13. September 2025, 23:15) | 40 | 94 % |
| Zodiac Project: Ponta Delgada by Florian Wortmann (on 9. July 2024, 19:49) | 117 | 97 % |
| Scrub Python (Palindrome Snake Sudoku) by peterchayward (on 18. July 2020, 11:25) | 47 | 95 % |
| Little Killer Twins by SudokuExplorer (on 26. September 2020, 02:00) | 42 | 94 % |
| the SAD Sudoku by bigger (on 4. December 2020, 09:57) | 21 | 90 % |
| Odd/Even Consecutive Killer 2 by Quarterthru (on 30. December 2020, 12:00) | 23 | 94 % |
| Quandary Lines by Tyrgannus (on 4. September 2021, 04:09) | 23 | 99 % |
| Balanced Cages by kolot (on 24. September 2021, 16:15) | 25 | 96 % |
| Maverick by Kafkapharnaum (on 27. August 2023, 08:10) | 25 | 100 % |
| Wichtel 2022 (8): Kornkreis auf dem Acker by wichtel (on 25. October 2023, 15:15) | 22 | 95 % |
