(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 | |
|---|---|---|---|
 | Game, set and no three in the corner by Fool on Hill (on 18. August 2022, 13:00) | 17 |  93 % |
| Die Kryptos - S05E03: Mathrax by tuace (on 1. September 2022, 20:22) | 21 | 91 % |
| The Average Sudoku 2 by Lyun Licuss (on 12. September 2022, 05:39) | 17 | 92 % |
| Turning Point by XeonRisq (on 5. October 2022, 04:00) | 24 | 92 % |
| Wheat, Oats and Poppy by jcgodart (on 15. October 2022, 08:19) | 19 | 93 % |
| SINIS by ICHTUES (on 16. October 2022, 06:00) | 31 | 95 % |
| Pinball Wizard by Blobz (on 28. November 2022, 16:00) | 20 | 92 % |
| Rope Skipping by Mad-Tyas (on 6. December 2022, 05:32) | 21 | 92 % |
| The Violin by XeonRisq (on 21. December 2022, 19:00) | 17 | 96 % |
| Spindrift by SeveNateNine (on 1. January 2023, 02:49) | 18 | 92 % |
| Area 81 by mathpesto (on 31. January 2023, 19:44) | 85 | 96 % |
| The Big Renbans by Nai Night (on 18. February 2023, 22:00) | 18 | 94 % |
| Unos - 8x8 Sudoku Pack by Joseph nehme (on 15. March 2023, 08:55) | 29 | 95 % |
| Unlucky Killers by bodemeister (on 9. May 2023, 03:02) | 19 | 94 % |
| Where's my sandwich? (Sandwich, Numbered Rooms, Kropki) by Chilly (on 19. June 2023, 17:36) | 22 | 92 % |
| 200 Light-years to Zetamath (Black Hole) by heliopolix (on 27. August 2023, 19:02) | 21 | 93 % |
| Betwen ty by glum_hippo (on 12. November 2023, 00:41) | 35 | 94 % |
| Equality Cube by Sniglett (on 4. December 2023, 00:56) | 43 | 96 % |
| A Killer Palindrome Sudoku by by81996672 (on 26. December 2023, 08:35) | 31 | 93 % |
| Target Acquired by Scojo (on 28. January 2024, 22:54) | 18 | 98 % |
