(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 | |
|---|---|---|---|
 | Polychromatic by oklux (on 28. March 2022, 20:32) | 34 |  94 % |
| Interlocked by Niverio (on 9. May 2022, 22:43) | 74 | 96 % |
| Reserved Parking (rush hour + variant sudoku) by rockratzero (on 30. April 2023, 10:58) | 68 | 93 % |
| Curious Consecutive Snake (by Paws and Ben) by starwarigami (on 19. January 2024, 11:45) | 38 | 95 % |
| Chaconopia 101 by Mad-Tyas (on 2. September 2025, 15:49) | 33 | 100 % |
| Dimensional Analysis by Fenners (on 2. May 2025, 19:16) | 98 | 97 % |
| Parity Renban by Oddlyeven (on 4. February 2023, 18:16) | 62 | 95 % |
| Sum Sets by Scruffamudda (on 28. April 2023, 11:09) | 65 | 97 % |
| Square Wheel by twototenth (on 6. July 2021, 07:00) | 30 | 95 % |
| Residual X-Rays by FullDeck-Missing (on 18. October 2022, 10:15) | 32 | 90 % |
| Pincers (Diagonal constraint killer sudoku) by sujoyku (on 10. September 2023, 09:32) | 109 | 95 % |
| Twofold arrows by NicoD (on 26. March 2025, 05:15) | 28 | 93 % |
| Goldenrod weathercock by NicoD (on 25. April 2025, 05:30) | 60 | 95 % |
| The Queen of Hearts' Labyrinth by Kjupatrick (on 20. January 2026, 10:20) | 32 | 93 % |
| screwdriver by aqjhs (on 6. May 2026, 08:20) | 29 | 93 % |
| Sextuple by Blashyrkh (on 24. July 2023, 12:36) | 54 | 93 % |
| Tetronimo Kakuro by julius64 (on 26. April 2013, 18:12) | 48 | 93 % |
| LM 2016 - Leftover: Yajilin by lupo (on 15. July 2016, 20:16) | 71 | 93 % |
| Toroidal anti-knight sudoku by Shinya (on 1. May 2020, 11:12) | 25 | 91 % |
| 10-in-9 calcudoku #3 (2021) by Nylimb (on 1. January 2021, 00:00) | 25 | 96 % |
