(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 | |
|---|---|---|---|
 | Liar Kropki by Dandelo (on 1. April 2022, 00:14) | 13 |  98 % |
| Sudoku X Weirdity by Jeet Sampat (on 18. April 2022, 03:14) | 27 | 96 % |
| CtC 500k Tribute by apiyo (on 30. August 2022, 05:56) | 14 | 91 % |
| Glyphs #3 by damasosos92 (on 12. January 2023, 16:17) | 27 | 95 % |
| Sum Sets by Scruffamudda (on 28. April 2023, 11:09) | 59 | 97 % |
| Diagonalization (Partial CC) by the_cogito (on 31. July 2023, 15:45) | 27 | 99 % |
| Circles and Between Lines by stimim (on 7. September 2023, 07:10) | 29 | 99 % |
| Pseudogenes by ViKingPrime (on 5. February 2024, 21:00) | 11 | 98 % |
| Yin-Yang Renbanominos 2 by Die Hard (on 12. May 2024, 00:06) | 11 | 93 % |
| Variety (6x6 Sudoku Pack) by Florian Wortmann (on 6. June 2024, 12:56) | 30 | 97 % |
| San Diego by SenatorGronk (on 21. August 2024, 02:49) | 27 | 94 % |
| Quali 2017 - Leftover: U-Bahn by ibag (on 29. January 2017, 20:17) | 47 | 97 % |
| Thermosn8kes by Nordy (on 5. August 2022, 08:00) | 56 | 95 % |
| Lion-Fish (Killer Sudoku) by abed hawila (on 6. March 2021, 18:51) | 88 | 96 % |
| ...Steigendes Sudoku II by Richard (on 23. July 2010, 12:00) | 79 | 90 % |
| Nonconsecutive Quads by LucyAudrin (on 24. July 2021, 20:18) | 45 | 90 % |
| Kropki Pairs Fillomino by Mark Sweep (on 23. November 2022, 10:00) | 39 | 93 % |
| In the Proximity by Lizzy01 (on 12. May 2023, 21:35) | 41 | 94 % |
| Road and River (Palindrome and Thermo-Region Sum Line) by BenTen (on 26. May 2023, 00:35) | 44 | 93 % |
| Moooooo by ademjaz (on 20. May 2024, 18:10) | 110 | 97 % |
