(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 | |
|---|---|---|---|
 | Classic Thermo Sudoku by Phistomefel (on 2. February 2021, 22:33) | 99 |  95 % |
| Herringbone by Qodec (on 26. October 2021, 18:02) | 89 | 99 % |
| Intersections by Xenonetix (on 22. August 2023, 23:23) | 41 | 91 % |
| U-Bahn unter Hochhäusern (Teil 5) by Zzzyxas (on 31. March 2012, 16:17) | 60 | 99 % |
| Little Killer X Sudoku by Phistomefel (on 25. April 2020, 08:15) | 75 | 94 % |
| Parity Party XIV, "Avec cages" by glum_hippo (on 4. January 2021, 13:13) | 21 | 94 % |
| Pentominominous by emmettcito (on 22. May 2021, 18:51) | 21 | 99 % |
| Renban Skyscrapers by Florian Wortmann (on 26. June 2021, 13:41) | 39 | 93 % |
| Torque by randall (on 16. October 2022, 07:21) | 23 | 93 % |
| Chaos in all Regions by Bother__ (on 4. December 2022, 21:29) | 26 | 93 % |
| Kropki Nurimisaki by tallcat (on 1. February 2023, 08:00) | 70 | 94 % |
| Feudalism (No-touch region sum lines sudoku) by Qodec (on 3. March 2023, 21:26) | 46 | 97 % |
| Far Far Away (Doubler Remote Sums Sudoku) by Agent (on 11. May 2024, 09:00) | 88 | 99 % |
| Factor Attractor (Ratio Sudoku) by Volatility (on 28. July 2020, 03:10) | 45 | 96 % |
| In the Zoo by Qodec (on 21. February 2021, 19:50) | 46 | 90 % |
| Bent arrows by JoWovrin (on 19. June 2021, 13:20) | 41 | 96 % |
| Juosan Killer sudoku by udukos (on 25. October 2021, 05:54) | 42 | 97 % |
| SunSET Over The Pyramid by zegres (on 20. December 2021, 23:12) | 37 | 96 % |
| Yin-Yang Thermos by Prof.Dori (on 10. October 2023, 17:23) | 45 | 94 % |
| Average Arrows (mit Thermometern) by glum_hippo (on 18. January 2021, 22:17) | 20 | 96 % |
