(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 | |
|---|---|---|---|
 | Nordschleife (Bosnian road/multiples pairs sudoku) by Qodec (on 29. November 2024, 20:31) | 47 |  95 % |
| Cavalry Archer (Anti-Knight Arrow Sudoku) by Phistomefel (on 2. June 2021, 21:09) | 185 | 97 % |
| A Very Odd Killer by Niverio (on 9. June 2021, 17:55) | 55 | 99 % |
| Tutotu by Fafrd (on 10. June 2022, 02:35) | 24 | 98 % |
| Double or Nothing by Oddlyeven (on 14. December 2022, 17:06) | 23 | 99 % |
| Lime Lines II by Calesch (on 10. March 2024, 21:03) | 26 | 92 % |
| Whispering Caves by yttrio (on 28. September 2024, 02:49) | 75 | 99 % |
| Leaving Las Vegas by SkepticalMario (on 16. November 2024, 00:13) | 29 | 92 % |
| Chaos Construction: FroZen Pentominoes by oklux (on 25. January 2025, 21:14) | 24 | 95 % |
| Japanische Summen gerade - ungerade by ibag (on 1. August 2012, 22:10) | 82 | 99 % |
| Little Thermo Sudoku by Alexander Rappa (on 16. June 2020, 16:15) | 34 | 96 % |
| Negative Caving by Mark Sweep (on 11. December 2020, 10:00) | 28 | 96 % |
| Wichtel 2020 (2): Die Himmelsbahn by wichtel (on 30. March 2021, 22:00) | 28 | 99 % |
| Murmuration (Little Killer) by emmettcito (on 31. March 2021, 19:38) | 32 | 97 % |
| Lucky (Symmetrical Palindromic Arrows) by AnalyticalNinja (on 26. July 2022, 23:55) | 33 | 97 % |
| Odd Blockade Runners 2 by JeffWajes (on 1. May 2023, 19:18) | 35 | 95 % |
| Everything is Wrogn by Sumanta(ANU) (on 30. August 2023, 06:23) | 34 | 93 % |
| X-Sum Sandwich Products by RockyRoer (on 19. November 2023, 05:32) | 29 | 95 % |
| Rhomboid Chaos by Sotehr (on 4. December 2024, 22:00) | 98 | 99 % |
| Adventskalender 2020, Türchen 7 - Twilight-Tapa by Zzzyxas (on 7. December 2020, 07:00) | 75 | 98 % |
