(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 | |
|---|---|---|---|
 | Parity Party XXIV, "Fast Times" by glum_hippo (on 30. November 2022, 17:14) | 14 |  98 % |
| Three-Line Riddle by JeremyDover (on 28. November 2022, 23:35) | 16 | 98 % |
| Temperature (Thermo, Entropy) by Mad-Tyas (on 30. January 2023, 08:22) | 49 | 94 % |
| Sandwich Box by ademjaz (on 7. February 2023, 20:29) | 18 | 97 % |
| Headcrab by Blashyrkh (on 25. February 2023, 23:17) | 16 | 95 % |
| Meta-Icing by Kafkapharnaum (on 11. July 2023, 01:24) | 12 | 100 % |
| Split Decision by ViKingPrime (on 30. August 2023, 04:42) | 18 | 96 % |
| On The Bottom Shelf (Nabner Modifier Sudoku) by Silverstep (on 9. September 2023, 00:24) | 12 | 94 % |
| Adventskalender 2023, Türchen 13 - Transparentes Yajilin by Zzzyxas (on 13. December 2023, 07:00) | 39 | 94 % |
| House Party by DadJokes (on 6. November 2023, 20:16) | 14 | 96 % |
| I'm going deeper underground... [Snake U-Bahn] by Christounet (on 1. December 2023, 14:13) | 23 | 100 % |
| Sky-Skyscraper by Phistomefel (on 22. March 2024, 15:29) | 78 | 99 % |
| Don't open the box by sanabas (on 4. July 2024, 15:05) | 12 | 93 % |
| Medieval Buffet by Manta-Ray (on 16. September 2024, 14:11) | 21 | 93 % |
| Ring Loop by Prof.Dori (on 29. September 2024, 02:09) | 23 | 91 % |
| X-Ray Vision (Yin Yang X-Sums Sudoku) by Agent (on 6. September 2022, 09:00) | 66 | 98 % |
| Everything in its Right Place by marty_sears (on 16. October 2023, 01:53) | 74 | 98 % |
| Killer - Region Sum Lines - Cave by abed hawila (on 9. May 2022, 20:41) | 65 | 100 % |
| Ma'at's Judgement - The Weighing of the Heart (Chaos Construction) by Chilly (on 22. November 2022, 16:58) | 66 | 100 % |
| Flaschenpost (Nurikabe Cipher Sudoku) by Agent (on 4. October 2022, 09:00) | 55 | 98 % |
