(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 | |
|---|---|---|---|
 | Dynamic Dots by Niverio (on 7. March 2022, 11:56) | 65 |  96 % |
| Triptych by Oddlyeven (on 16. July 2025, 16:47) | 61 | 95 % |
| Mounted Archery by Joseph nehme (on 29. January 2022, 08:10) | 75 | 90 % |
| MasyU-Bahn (Teil 3) by Zzzyxas (on 2. April 2015, 20:35) | 63 | 99 % |
| HalfYin-TwoYang by DJV (on 11. January 2023, 15:37) | 77 | 94 % |
| Heated Chaos by yttrio (on 24. August 2024, 01:45) | 155 | 98 % |
| Zipper Zipper by antiknight (on 20. December 2023, 03:32) | 73 | 97 % |
| Equal Sudoku II by Realshaggy (on 29. April 2013, 12:23) | 74 | 94 % |
| Some Balancing Product by Manta-Ray (on 9. November 2025, 12:36) | 76 | 96 % |
| Dandelion (Anti-Knight Thermo Sudoku) by Phistomefel (on 7. June 2022, 02:45) | 175 | 97 % |
| Chaos FilloSudokumino by MagnusJosefsson (on 14. September 2022, 15:00) | 153 | 98 % |
| The Goldilocks Zone by marty_sears (on 14. September 2024, 15:04) | 154 | 99 % |
| Chaos Construction: Corridors by vidarino (on 1. January 2022, 14:24) | 76 | 98 % |
| Square Dance by Jay Dyer (on 9. July 2024, 22:47) | 85 | 96 % |
| Renban Snakes by Chad (on 16. September 2024, 03:37) | 89 | 94 % |
| Pentomino-Rundreise by Phistomefel (on 16. August 2020, 00:23) | 83 | 99 % |
| Hooked on Sudoku by Blashyrkh (on 18. June 2024, 10:42) | 97 | 94 % |
| Internal X-Sums (Chaos construction) by Oripy (on 14. April 2025, 12:00) | 91 | 98 % |
| Dutch Chaos Loop (CC) by gdc (on 15. July 2025, 14:32) | 96 | 99 % |
| Six-pack Linked Sudokus by Genomico (on 25. August 2020, 00:57) | 96 | 97 % |
