(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 | |
|---|---|---|---|
 | Epiphany (Numbered Room and Region Sum Line) by Playmaker6174 (on 30. September 2022, 10:32) | 57 |  97 % |
| Sum Fillomino by AnalyticalNinja (on 10. September 2024, 18:10) | 92 | 98 % |
| Renban Pünktchen Spektakel by Luigi (on 27. June 2011, 13:10) | 30 | 95 % |
| 123... Schiffe versenken by lupo (on 23. May 2015, 00:00) | 30 | 93 % |
| Snake Sum Sudoku 6 by Quarterthru (on 15. July 2020, 20:00) | 19 | 98 % |
| Double Value Killer Sudoku by Willy Wonka (on 30. August 2020, 07:18) | 40 | 97 % |
| Divisible Cage Totals #2 (oops! no totals!) by RockyRoer (on 30. October 2020, 10:56) | 33 | 96 % |
| Juicebox by TotallyNormalCat (on 18. December 2020, 23:00) | 24 | 96 % |
| Black and White by zetamath (on 12. February 2021, 23:34) | 81 | 98 % |
| Diagonal Skyscraper Sudoku by MagnusJosefsson (on 15. April 2021, 16:32) | 38 | 97 % |
| Renban Skyscrapers (CTC 400k subscribers) by Florian Wortmann (on 3. October 2021, 12:42) | 49 | 92 % |
| Seattle by ICHTUES (on 7. November 2021, 06:00) | 69 | 98 % |
| Sandwich Fillomino #3 by Mark Sweep (on 31. December 2021, 10:00) | 17 | 96 % |
| Cowgirl by OhHeyGuysItsMax (on 18. February 2022, 19:34) | 49 | 92 % |
| Viper Valley Trail Map (Triple Snake Sudoku) by Nordy (on 20. March 2022, 04:43) | 15 | 98 % |
| Cycle Sandwich by SirSchmoopy (on 16. May 2022, 23:08) | 20 | 93 % |
| Frankly by wooferzfg (on 20. July 2022, 17:44) | 16 | 93 % |
| Baby Dragon by zetamath (on 18. November 2022, 17:23) | 145 | 95 % |
| Free Solo by Blashyrkh (on 15. March 2023, 11:51) | 36 | 95 % |
| Loop Knight Region by Prof.Dori (on 21. July 2023, 23:37) | 16 | 91 % |
