(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 | |
|---|---|---|---|
 | Pawn's SET Piece (6x6) by mormagli (on 23. October 2022, 02:48) | 13 |  98 % |
| Photonic Crystal Wings by heliopolix (on 14. October 2023, 02:47) | 15 | 100 % |
| Home Run by Jobo (on 21. May 2024, 21:10) | 22 | 91 % |
| 1234 (Arrow Sudoku) by ProRock (on 24. June 2024, 15:21) | 27 | 90 % |
| Sudoku Variants Series (290) - Product Ltd Sudoku by Richard (on 14. October 2020, 00:00) | 61 | 94 % |
| Drumsticks by antiknight (on 18. May 2022, 12:01) | 30 | 92 % |
| Roman Lockout by Jay Dyer (on 19. February 2022, 23:16) | 17 | 98 % |
| Swords by antiknight (on 5. April 2022, 20:45) | 38 | 93 % |
| 30-1=29 by EricRathbun (on 15. January 2023, 01:58) | 18 | 95 % |
| Underground Traffic (U-Bahn tetromino) by Samish (on 10. October 2024, 12:09) | 14 | 98 % |
| Heranwachsende Rundwege by Calavera (on 27. November 2010, 20:38) | 52 | 99 % |
| Killer Arrows by abed hawila (on 4. February 2021, 22:39) | 40 | 96 % |
| Little Killer by Strosahl (on 7. April 2021, 05:36) | 22 | 99 % |
| 440 Hz by HalfBakedLunatic (on 19. March 2024, 02:38) | 22 | 92 % |
| Can You Count the Whispers? by Tobias Brixner (on 26. May 2024, 16:07) | 41 | 96 % |
| Liar Japanese Sums #9 - Cave (Aqre) by Niverio (on 1. August 2024, 19:24) | 20 | 100 % |
| Indianapolis by ICHTUES (on 13. November 2022, 06:00) | 46 | 95 % |
| Little Miracle by Prof.Dori (on 13. May 2024, 18:26) | 85 | 97 % |
| Pagoda by TotallyNormalCat (on 8. April 2021, 00:30) | 24 | 100 % |
| Fishie by zetamath (on 7. September 2021, 01:33) | 50 | 95 % |
