(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 | |
|---|---|---|---|
 | Three Arrows by Onion Suit (on 5. May 2021, 02:31) | 23 |  94 % |
| Parity Party Renban Sudoku — 'Party Bot' by PixelPlucker (on 31. May 2021, 16:05) | 17 | 95 % |
| Battenburg Killer by MavericksJD (on 12. June 2021, 14:06) | 25 | 95 % |
| Close Friends by mathpesto (on 2. December 2021, 21:43) | 30 | 95 % |
| Just Arrows! by Jeet Sampat (on 23. January 2022, 00:41) | 18 | 97 % |
| Faces by Pallando (on 11. March 2022, 11:53) | 18 | 100 % |
| Viper Valley Trail Map (Triple Snake Sudoku) by Nordy (on 20. March 2022, 04:43) | 13 | 98 % |
| Nineteen? (X-sums Chaos Construction 2) by Lizzy01 (on 13. April 2022, 21:17) | 46 | 99 % |
| A riddle, wrapped in an entropic line, inside a sudoku by Raumplaner (on 24. April 2022, 15:17) | 13 | 93 % |
| Order of Yevon by Tyrgannus (on 30. May 2022, 12:50) | 15 | 94 % |
| Starburst (Antiknight Arrows) by Florian Wortmann (on 19. June 2022, 15:06) | 44 | 90 % |
| Who Likes Knights? by Yawnus (on 30. June 2022, 10:12) | 17 | 96 % |
| Mineshweepa by mnasti2 (on 10. August 2022, 20:45) | 23 | 94 % |
| Cartesian 159 by noswald (on 19. August 2022, 07:09) | 16 | 91 % |
| Ambiguous Identical Little Killers by Jeet Sampat (on 13. October 2022, 21:32) | 20 | 95 % |
| Entropy Dots by Innocuous (on 17. October 2022, 19:49) | 24 | 96 % |
| Sashigane Sudoku by Ambrose (on 14. November 2022, 14:06) | 68 | 96 % |
| Growing Up by the_cogito (on 22. December 2022, 19:43) | 29 | 99 % |
| No Odd Cages (Parity line / killer sudoku) by Mr.Menace (on 11. June 2023, 09:01) | 39 | 96 % |
| I'm a Vampire (Nicolas Cage) by gdc (on 6. August 2023, 20:48) | 18 | 98 % |
