(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 | |
|---|---|---|---|
 | Fort Worth by ICHTUES (on 5. June 2022, 06:00) | 28 |  97 % |
| Penrod by krangune (on 25. June 2022, 13:03) | 15 | 91 % |
| Topsy-Turvy by zetamath (on 1. August 2022, 19:41) | 73 | 96 % |
| Friendly Ropes (11x11 Deconstruction) by purpl (on 31. August 2022, 17:51) | 30 | 95 % |
| Spoiled Child by Perladel (on 11. September 2022, 11:30) | 13 | 95 % |
| Shikaku Fillomino #2 (9x9) by the_cogito (on 15. September 2022, 15:41) | 39 | 95 % |
| Nosy Neighbors by Ambrose (on 18. September 2022, 18:21) | 10 | 95 % |
| Average Sudoku 3 by Lyun Licuss (on 19. September 2022, 10:08) | 19 | 98 % |
| Hooked (Run-on Renbans/X-sums) by dumediat (on 23. September 2022, 20:38) | 16 | 94 % |
| Yin Yang Icebarn by Jay Dyer (on 28. September 2022, 00:06) | 22 | 100 % |
| Fusion by Crusader175 (on 7. October 2022, 17:12) | 12 | 93 % |
| California Mountain Snake (Yin Yang Sudoku) by Video Floral (on 9. October 2022, 13:58) | 57 | 95 % |
| Sasayaki Misaki (Whispering Cape) - Nurimisaki/German Whispers Sudoku by rockratzero (on 10. October 2022, 18:09) | 14 | 96 % |
| Bird of Paradise (Segmented Region Sum Lines) by AnalyticalNinja (on 18. October 2022, 01:11) | 12 | 98 % |
| Pentomino Jigsaw by XeonRisq (on 19. October 2022, 03:00) | 12 | 95 % |
| Hungry Hungry Renbans by sunnyjum (on 30. October 2022, 15:31) | 21 | 96 % |
| Kolot Challenge Accepted by Andrewsarchus (on 7. November 2022, 14:44) | 17 | 91 % |
| Route 75 by mathpesto (on 18. November 2022, 22:16) | 35 | 97 % |
| ModBan Knights by jcgodart (on 27. November 2022, 05:36) | 23 | 91 % |
| Four Five Six by Joseph nehme (on 2. December 2022, 07:58) | 53 | 94 % |
