(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 | |
|---|---|---|---|
 | A Special Tribute: 1K for Zeta! by Playmaker6174 (on 12. May 2022, 08:42) | 23 |  96 % |
| Liar Fillomino by KNT (on 16. June 2022, 03:40) | 38 | 99 % |
| Cliffs of Insanity by DarthParadox (on 27. June 2022, 00:06) | 20 | 93 % |
| Bullet Train by wooferzfg (on 11. April 2023, 05:29) | 40 | 100 % |
| One by igniteice (on 29. November 2023, 15:48) | 23 | 93 % |
| Efflorescence [Arrows, Killer] by 3good5you (on 29. May 2024, 00:56) | 29 | 95 % |
| obezyanka nol by aqjhs (on 30. August 2024, 08:07) | 21 | 96 % |
| Can I "borrow" some carrots? by SecondBlue (on 20. December 2024, 02:54) | 18 | 96 % |
| Spot the Difference by marty_sears (on 13. December 2023, 03:29) | 110 | 97 % |
| Sum-thing or Other by Jay Dyer (on 23. November 2024, 21:37) | 105 | 96 % |
| Coordinate Arrows (Sudoku) by Piatato (on 13. February 2022, 18:17) | 116 | 96 % |
| Skyline by Qodec (on 12. December 2020, 11:12) | 43 | 95 % |
| Roller Coaster mit Extras 20 by Uhu (on 13. April 2021, 09:31) | 37 | 99 % |
| Matching by kolot (on 15. November 2021, 05:22) | 82 | 98 % |
| Killer Sudoku: Mutated Fish by Playmaker6174 (on 20. February 2022, 11:52) | 47 | 97 % |
| Pennington by wooferzfg (on 6. October 2022, 05:42) | 38 | 96 % |
| Heavy Ominoes by Jay Dyer (on 19. May 2024, 23:48) | 46 | 97 % |
| Lake Trip by TotallyNormalCat (on 12. February 2021, 17:30) | 66 | 98 % |
| Sudoku Variants Series (300) - Killer Skyscrapers Sudoku by Richard (on 22. December 2020, 22:00) | 98 | 97 % |
| 14 Standards by JonaS2010 (on 1. April 2020, 14:14) | 133 | 93 % |
