(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 | |
|---|---|---|---|
 | Skyline by Qodec (on 12. December 2020, 11:12) | 42 |  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) | 15 | 93 % |
| XY Differences V, "Knapp daneben" by glum_hippo (on 29. December 2020, 17:39) | 20 | 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) | 29 | 100 % |
| Life on 49 Cells by SudokuExplorer (on 2. March 2021, 01:00) | 35 | 97 % |
| Position Sums mit Pfeilen, "Air Opossum" by glum_hippo (on 24. February 2021, 06:00) | 22 | 97 % |
| Coded Skyscrapers Sudoku (Duck & Hippo) by mandourin (on 12. March 2021, 17:43) | 25 | 97 % |
| Kropki Pairs (Barbed Wire) by emmettcito (on 13. March 2021, 19:13) | 18 | 90 % |
| Disconnected Arrows by Strosahl (on 21. March 2021, 04:26) | 18 | 98 % |
| Between the 'Scrapers v2 by LKegel (on 22. March 2021, 16:02) | 16 | 96 % |
| Compass Fillomino #2 by MagnusJosefsson (on 8. April 2021, 18:35) | 41 | 97 % |
| Catch the fish (Arrows) by abed hawila (on 12. April 2021, 12:05) | 26 | 98 % |
| Arrow Galore by SudokuExplorer (on 13. July 2021, 19:15) | 38 | 98 % |
| Bedazzled by GarlicBredFries (on 7. May 2021, 18:54) | 16 | 92 % |
| Welcome To Mars (Anti-knight/Thermo Sudoku) by EliasKar (on 8. May 2021, 19:53) | 33 | 92 % |
| What's In The Box by Quarterthru (on 11. May 2021, 12:00) | 21 | 91 % |
| Frankfurt by Mark Sweep (on 28. May 2021, 10:00) | 27 | 99 % |
| Neighbor Feud by Piatato (on 29. May 2021, 15:58) | 30 | 95 % |
