(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 | |
|---|---|---|---|
 | Hidden X-Sums by jwsinclair (on 4. July 2022, 20:13) | 52 |  98 % |
| Skyscraper Index by jwsinclair (on 11. July 2022, 19:32) | 16 | 97 % |
| Stingray by mormagli (on 25. September 2022, 04:47) | 22 | 95 % |
| The Fountain by Tobias Brixner (on 14. October 2023, 11:49) | 101 | 96 % |
| Beauty Mark by zetamath (on 24. August 2023, 21:36) | 158 | 95 % |
| Regiscissors by Tyrgannus (on 16. July 2021, 00:51) | 49 | 96 % |
| Solver, there's a fly on my Sudoku! by IcyFruit (on 25. November 2023, 22:39) | 112 | 97 % |
| Sudoku Variants Series (279) - Parity Sections Sudoku by Richard (on 29. July 2020, 00:00) | 73 | 98 % |
| Don't you fear the drumsticks by chameleon (on 26. February 2023, 12:41) | 70 | 94 % |
| Merry Christmas Zetamath! by Scojo (on 27. March 2023, 01:29) | 36 | 92 % |
| LM 2024 Leftover: Extra Region U-Bahn by uvo (on 21. June 2024, 12:00) | 35 | 96 % |
| Hex Masyu with Branching by kiwijam (on 26. April 2013, 04:39) | 63 | 96 % |
| Two-Doku Xtreme by Stavros96 (on 3. October 2020, 03:53) | 16 | 98 % |
| Distant Relations #2 by Big Tiger (on 13. March 2021, 06:27) | 15 | 94 % |
| Symmetry? by Qodec (on 13. April 2021, 20:16) | 79 | 90 % |
| Star Nurikabe N± by BenceJoful (on 2. October 2021, 02:24) | 30 | 94 % |
| arROw SudOkU - wHisPErinG cYCle by filuta (on 26. October 2021, 23:09) | 15 | 94 % |
| Three is a Crowd Sudoku #2 by Genomico (on 27. September 2022, 20:55) | 15 | 100 % |
| Twix by ICHTUES (on 2. October 2022, 06:00) | 15 | 90 % |
| The Violin by XeonRisq (on 21. December 2022, 19:00) | 19 | 96 % |
