(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 | |
|---|---|---|---|
 | Red Colour by apiyo (on 16. April 2022, 14:02) | 32 |  95 % |
| Why Did It Have To Be Snakes? by DadJokes (on 7. September 2022, 18:41) | 32 | 96 % |
| Under Pressure (Pressurized Aquariums) by AnalyticalNinja (on 22. December 2022, 15:00) | 94 | 98 % |
| Split Connections (U-Bahn + Loop) by Nordy (on 31. July 2023, 08:00) | 26 | 96 % |
| Pentomino-Hitori by tyskhubi (on 2. August 2014, 09:41) | 31 | 94 % |
| XV Thermo Sudoku by Quarterthru (on 28. February 2021, 12:00) | 64 | 91 % |
| Myopia by wuzzle (on 1. January 2021, 00:00) | 32 | 95 % |
| Betwen ty by glum_hippo (on 12. November 2023, 00:41) | 34 | 94 % |
| Straddle by marty_sears (on 26. December 2023, 22:35) | 66 | 97 % |
| Sudoku Variants Series (332) - Teleportation Cycle Sums Sudoku by Richard (on 4. August 2021, 00:00) | 73 | 98 % |
| Crescent Archery by Xendari (on 14. November 2022, 08:57) | 39 | 93 % |
| 24 Rätsel in 24 Stunden (Teil 3) - Höhle by Zzzyxas (on 24. June 2017, 02:24) | 79 | 92 % |
| Wichtel 2016 (5): Stallungen am Nordpol by wichtel (on 12. June 2017, 22:00) | 32 | 96 % |
| Little Killer Thermo Palindrome Sudoku by Cane_Puzzles (on 19. March 2021, 16:16) | 41 | 94 % |
| Circles and Adders by Jay Dyer (on 24. December 2023, 12:04) | 36 | 95 % |
| Ignition! (Thermo) by Blashyrkh (on 19. October 2024, 14:41) | 84 | 94 % |
| Bäume im Herbst: Mini-Höhle by r45 (on 7. November 2019, 20:00) | 38 | 98 % |
| Two-Zip by AFrayedKnot (on 8. October 2024, 08:34) | 46 | 95 % |
| Monstertruck Logical by AnnaTh (on 7. June 2010, 16:21) | 40 | 90 % |
| Refraction by grkles (on 28. May 2021, 23:03) | 41 | 93 % |
