(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 | |
|---|---|---|---|
 | The blue square by ademjaz (on 20. January 2023, 15:42) | 39 |  97 % |
| Competitive Tetris by Bremster (on 23. September 2022, 09:00) | 72 | 94 % |
| Irregular Antiking Sudoku by spxtr (on 15. September 2020, 01:45) | 22 | 99 % |
| Semi-miraculous Sudoku by clover (on 26. September 2020, 13:00) | 47 | 93 % |
| Hugging Arrows (Disjoint Arrow Sudoku) by EliasKar (on 26. February 2021, 15:11) | 24 | 97 % |
| The Radiant Diamond Ring by fjam (on 18. August 2021, 19:36) | 21 | 91 % |
| Watch my Sandwich by Angelo (on 7. March 2022, 18:22) | 20 | 97 % |
| Almost Satisfaction by Joseph nehme (on 12. February 2022, 07:15) | 22 | 97 % |
| Trisection by jsmirob (on 15. February 2022, 22:39) | 21 | 93 % |
| Palette Paradise by siron2133 (on 2. September 2022, 18:37) | 21 | 97 % |
| Secrets of Entropy by Mad-Tyas (on 26. December 2022, 03:00) | 41 | 95 % |
| Extraterrestrial Japanese Sums by KNT (on 16. February 2023, 01:26) | 37 | 100 % |
| The Slightly Irregular Fire Engine by glum_hippo (on 19. February 2023, 05:51) | 23 | 94 % |
| Chaos Snakes by Dag H (on 31. March 2023, 03:35) | 22 | 91 % |
| Some Quads Somedoku by blackjackfitz (on 5. February 2025, 03:56) | 26 | 96 % |
| Cross Purposes (Quad Sums Killer Anti-King) by tallcat (on 6. June 2022, 02:42) | 60 | 99 % |
| Runder Rundweg 4 by pwahs (on 8. August 2009, 17:26) | 42 | 95 % |
| Little Killer Thermo Sudoku by Willy Wonka (on 30. September 2020, 23:40) | 63 | 98 % |
| Mounted Archery by Joseph nehme (on 29. January 2022, 08:10) | 70 | 90 % |
| Shindig Redone (Anti-Knight, Renban) by juddimal (on 4. January 2025, 00:43) | 69 | 97 % |
