(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 | |
|---|---|---|---|
 | 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 % |
| 123...9 by Qodec (on 28. February 2021, 14:48) | 68 | 95 % |
| 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) | 19 | 98 % |
| Between the 'Scrapers v2 by LKegel (on 22. March 2021, 16:02) | 18 | 96 % |
| Sandwich Capsules by RockyRoer (on 28. March 2021, 22:17) | 40 | 99 % |
| Scaffolding (Arrow Sudoku) by emmettcito (on 24. April 2021, 21:24) | 37 | 95 % |
| 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) | 36 | 92 % |
| Stostone - Aoi's Big Birthday by athin (on 15. May 2021, 07:00) | 15 | 98 % |
| What's In The Box by Quarterthru (on 11. May 2021, 12:00) | 23 | 91 % |
| Frankfurt by Mark Sweep (on 28. May 2021, 10:00) | 28 | 99 % |
| Mathlements by Qodec (on 7. June 2021, 19:47) | 53 | 99 % |
| Ricochet (Arrow Killer) by tallcat (on 11. June 2021, 16:01) | 56 | 91 % |
| Arrow Australis by jacksongriggs (on 24. June 2021, 22:43) | 17 | 92 % |
| Category 5 Hurricane by Polycarp (on 14. July 2021, 20:14) | 15 | 90 % |
| Roller Coaster mit Extras 21 by Uhu (on 22. July 2021, 17:27) | 33 | 98 % |
