(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 | |
|---|---|---|---|
 | Mini-Colossal Octoquadri I: Loop 12 by MaizeGator (on 20. March 2025, 02:53) | 20 |  92 % |
| Summation U-Bahn (Knapp-daneben) by goodcity (on 25. August 2025, 15:36) | 17 | 100 % |
| Balancing Banshees by jakestilesowen (on 31. October 2025, 01:45) | 15 | 90 % |
| Kropki Dots in Irregular Regions by Md88keys (on 2. January 2026, 05:51) | 27 | 97 % |
| Knapp daneben-Tapa by flooser (on 10. June 2009, 12:32) | 92 | 96 % |
| Stingray by zetamath (on 23. June 2021, 19:36) | 40 | 92 % |
| Maximum Security (Killer cages, Doublers) by AnalyticalNinja (on 8. February 2023, 21:15) | 39 | 96 % |
| 24 Rätsel in 24 Stunden (Teil 16) - Koralle by Zzzyxas (on 24. June 2017, 15:24) | 80 | 93 % |
| ¿? Mystery products ¿? by Qodec (on 28. August 2020, 16:32) | 24 | 97 % |
| Thermo Arrow Sudoku by clover (on 15. October 2020, 00:54) | 20 | 97 % |
| 真笑Puzzles034--69Sandwiches (7)--XY Index2 by cdwg2000 (on 14. March 2021, 09:51) | 18 | 100 % |
| Chaos Construction: Equality by SSG (on 27. February 2022, 07:08) | 18 | 97 % |
| Sæpenumerō by mathpesto (on 4. May 2022, 04:17) | 38 | 98 % |
| Fifth Floor Penthouses by SSG (on 8. July 2022, 07:32) | 22 | 91 % |
| 4's and 7's by the_cogito (on 26. July 2022, 21:20) | 20 | 92 % |
| All Things Being Equal by actinide (on 6. August 2022, 14:59) | 40 | 95 % |
| Fogrotto by mathpesto (on 17. December 2022, 15:29) | 203 | 96 % |
| Death Spiral by EricRathbun (on 4. February 2023, 18:12) | 27 | 94 % |
| Counterclockwise Killer by bodemeister (on 11. February 2023, 15:26) | 21 | 92 % |
| Double U is actually an S by ademjaz (on 28. February 2023, 00:08) | 24 | 92 % |
