(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 tilt at full rank by ralphwaldo1 (on 8. February 2025, 19:16) | 121 |  99 % |
| Anticamel Coloring Book by gdc (on 30. December 2024, 21:26) | 133 | 97 % |
| Chinese Takeaway (Yin Yang Killer) by BenTen (on 3. May 2023, 23:51) | 154 | 97 % |
| So ein Durcheinander by Luigi (on 16. September 2009, 09:42) | 19 | 94 % |
| Binary Sudoku 11 by stephane.bura (on 26. April 2020, 23:39) | 20 | 96 % |
| Crypto Sandwich Sudoku - Easy as ABC by KeyserSoze (on 3. May 2020, 15:52) | 30 | 96 % |
| Wichtel 2019 (8): Notfall in der Wichtelwerkstatt by wichtel (on 23. September 2020, 18:21) | 39 | 98 % |
| Spiral Galaxies / Bent Hashi by stefliew (on 23. August 2020, 18:20) | 16 | 94 % |
| Anti-Killer Sudoku #3 by JoJoMcFroYo (on 16. September 2020, 22:49) | 22 | 96 % |
| Down The Drain Arrow Sudoku by bram (on 18. September 2020, 21:40) | 44 | 95 % |
| Knightsjump Sudoku by Prutsbeest (on 21. November 2020, 21:29) | 13 | 90 % |
| Tag 13 - Nurikabe by CJK (on 28. January 2021, 16:18) | 52 | 92 % |
| Only Little Killer Sudoku by ICHTUES (on 7. March 2021, 06:00) | 25 | 96 % |
| PatrickRuchti - Kryptosudoku 2.0 by Johannes Quack (on 27. March 2021, 09:23) | 12 | 95 % |
| 真笑Puzzles037--Chaos Construction-- “邹子”002 by cdwg2000 (on 2. April 2021, 15:51) | 23 | 94 % |
| High Life by Aaronomys (on 24. April 2021, 10:29) | 34 | 97 % |
| Refraction by grkles (on 28. May 2021, 23:03) | 43 | 94 % |
| The Horse Whisperer / der Pferdeflüsterer by Zombie Hunter (on 12. July 2021, 05:18) | 25 | 90 % |
| Boxed In 2: Bigger Box by Cane_Puzzles (on 16. September 2021, 15:20) | 26 | 92 % |
| Chromatic Whispers by Nahileon (on 28. September 2021, 19:32) | 40 | 92 % |
