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 % |