(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 | |
|---|---|---|---|
 | Unter der Lupe (Instructionless) by Myxo (on 27. September 2023, 10:20) | 35 |  99 % |
| Jumelage [RSL Renban Twin Sudokus] by Christounet (on 22. October 2024, 13:09) | 34 | 96 % |
| Icing disaster (Region sum lines/X-sums) by dumediat (on 30. June 2023, 22:38) | 69 | 93 % |
| Airlocks (Pentominous) by Gliperal (on 17. May 2021, 01:04) | 29 | 92 % |
| Tapa Mashup with Clones by Mark Sweep (on 25. February 2022, 10:00) | 32 | 98 % |
| Roller Coaster Cipher by ONeill (on 16. June 2024, 16:26) | 30 | 99 % |
| Double, Double by zetamath (on 13. August 2022, 22:07) | 82 | 97 % |
| Vampires by Mad-Tyas (on 23. January 2023, 11:06) | 76 | 96 % |
| Toroidaler Kosmos by usp (on 27. February 2015, 00:00) | 23 | 92 % |
| Morgen ist Ostern by ibag (on 26. March 2016, 05:00) | 25 | 97 % |
| Bounce by zetamath (on 25. April 2022, 16:17) | 51 | 99 % |
| Thermo's Adea by PotatoHead21 (on 30. April 2022, 23:07) | 25 | 92 % |
| Amphiboly by SSG (on 14. October 2022, 05:42) | 21 | 100 % |
| Suguru Chaos Deconstruction: Zipper Lines by ONeill (on 24. December 2023, 04:34) | 60 | 99 % |
| Little Nuts by Qodec (on 12. May 2021, 12:55) | 40 | 96 % |
| AAAAAAAAA (Cipher Numbered Rooms) by tesseralis (on 8. July 2022, 10:06) | 35 | 94 % |
| Limitless Potential #1: Zero to Infinity by Playmaker6174 (on 23. April 2023, 09:53) | 39 | 98 % |
| Dual Slitherlink by Phistomefel (on 8. May 2020, 11:09) | 57 | 97 % |
| T-Time (Anti-Knight Renban Killer Sudoku) by Phistomefel (on 13. June 2023, 21:12) | 175 | 97 % |
| LM-Überbleibsel: Krypto-Teamrunde by uvo (on 28. November 2015, 10:00) | 75 | 99 % |
