(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 | |
|---|---|---|---|
 | Decidoku by Innocuous (on 18. August 2021, 01:31) | 18 |  95 % |
| Dance Partners / Die Tanzpartner by Auul (on 13. September 2021, 07:44) | 12 | 93 % |
| Framed Bats by Emphyrio (on 2. October 2021, 18:53) | 25 | 95 % |
| The X Days of 12-Mas by Mojo872 (on 1. December 2021, 16:49) | 20 | 90 % |
| Antiknight Whispers by thoughtbyte (on 12. February 2022, 08:58) | 35 | 91 % |
| Unum Singulis by Eclectic_Hoosier (on 6. April 2022, 00:46) | 20 | 92 % |
| Alien Cube by Nahileon (on 23. March 2022, 17:36) | 34 | 96 % |
| ThanX (Sudoku25) by Sumanta(ANU) (on 4. May 2022, 14:27) | 27 | 90 % |
| Odd Turtle Sudoku by Thorsby (on 10. June 2022, 05:02) | 18 | 98 % |
| Watched (Run-on Renbans) by riffclown (on 12. September 2022, 00:18) | 40 | 98 % |
| The Butterfly - (Region Sum/Renban Lines) by Ennead (on 12. September 2022, 20:51) | 14 | 93 % |
| The Cs by ademjaz (on 23. September 2022, 00:54) | 35 | 93 % |
| Chaos Constriction (6x6) by Nordy (on 4. October 2022, 00:34) | 16 | 90 % |
| Kropki a-lien by chameleon (on 15. October 2022, 02:59) | 17 | 93 % |
| X-Sandscrapers by WedgeOfCheese (on 25. October 2022, 23:01) | 18 | 93 % |
| SC27 - Arrows 2 by kuraban (on 14. December 2022, 21:16) | 27 | 97 % |
| Ikpork? by SSG (on 28. February 2023, 07:15) | 32 | 94 % |
| Free Solo by Blashyrkh (on 15. March 2023, 11:51) | 39 | 95 % |
| Precision (Equalines, Doubler) by Mad-Tyas (on 25. April 2023, 09:32) | 23 | 99 % |
| Squeezed in the dark by simoons (on 10. May 2023, 01:33) | 14 | 90 % |
