(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 | |
|---|---|---|---|
 | 真笑Puzzles041--Wall Sudoku by cdwg2000 (on 29. January 2022, 13:40) | 21 |  97 % |
| Beyond (Indexing Miracle) by Crusader175 (on 27. August 2023, 14:00) | 23 | 91 % |
| Friendlynori by Calesch (on 16. July 2024, 01:02) | 19 | 96 % |
| Burger Xtra by Wuschel (on 7. February 2026, 20:40) | 19 | 91 % |
| Crescent Archery by Xendari (on 14. November 2022, 08:57) | 43 | 93 % |
| Renban Fillomino by MagnusJosefsson (on 26. March 2022, 14:01) | 84 | 98 % |
| Encrypted Sandwich by cfop (on 31. January 2021, 21:18) | 19 | 95 % |
| Bleu Blanc Dot by PetLov (on 27. March 2021, 12:44) | 19 | 93 % |
| Carnivorous Pansy by PjotrV (on 10. April 2021, 09:22) | 20 | 95 % |
| 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) | 102 | 96 % |
| Regiscissors by Tyrgannus (on 16. July 2021, 00:51) | 50 | 96 % |
| 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) | 37 | 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 % |
