(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 | |
|---|---|---|---|
 | Pencil puzzle sudoku hybrid series #1 - Look-air sudoku by Aspartagcus (on 28. October 2020, 11:11) | 13 |  90 % |
| The Devil is in the Details by Gliperal (on 31. October 2020, 02:50) | 53 | 97 % |
| Japanischer Summen-Rundweg 2358 (2) by Uhu (on 31. October 2020, 11:16) | 48 | 99 % |
| Masyu Loop Sudoku by Jesper (on 10. November 2020, 09:49) | 61 | 98 % |
| Antiknight killer - Barcelona Floor Tile by Ferranrojas (on 12. November 2020, 01:32) | 25 | 96 % |
| Mystery Sandwich Sudoku by cdwg2000 (on 11. January 2021, 23:11) | 14 | 95 % |
| The Python (Palindrome) by ICHTUES (on 15. November 2020, 06:00) | 31 | 95 % |
| Skyline by Qodec (on 12. December 2020, 11:12) | 49 | 96 % |
| The Night Before Christmas Sudoku by JonnyKaufman (on 23. December 2020, 17:44) | 30 | 96 % |
| XV | VX Sudoku by Aspartagcus (on 30. December 2020, 16:28) | 16 | 93 % |
| XY Differences V, "Knapp daneben" by glum_hippo (on 29. December 2020, 17:39) | 21 | 95 % |
| Yajilin Total/Regions 4 by Dandelo (on 6. January 2021, 18:58) | 17 | 100 % |
| Switching Skyscrapers by udukos (on 31. January 2021, 17:50) | 33 | 100 % |
| Life on 49 Cells by SudokuExplorer (on 2. March 2021, 01:00) | 36 | 97 % |
| Coded Skyscrapers Sudoku (Duck & Hippo) by mandourin (on 12. March 2021, 17:43) | 26 | 97 % |
| Kropki Pairs (Barbed Wire) by emmettcito (on 13. March 2021, 19:13) | 20 | 91 % |
| Disconnected Arrows by Strosahl (on 21. March 2021, 04:26) | 18 | 98 % |
| Between the 'Scrapers v2 by LKegel (on 22. March 2021, 16:02) | 17 | 96 % |
| 007 - Licence to Kill by Kafkapharnaum (on 25. March 2021, 19:45) | 23 | 97 % |
| Sandwich Capsules by RockyRoer (on 28. March 2021, 22:17) | 40 | 99 % |
