(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 | |
|---|---|---|---|
 | In Between the Spaces by XeonRisq (on 12. October 2022, 04:00) | 41 |  93 % |
| Ready For Launch by Niverio (on 7. May 2024, 10:19) | 47 | 96 % |
| Chaotic Pointers by arbitrary (on 7. December 2024, 23:49) | 38 | 93 % |
| X---V*9.4 by NurglesGift (on 27. September 2025, 16:29) | 47 | 95 % |
| Bafflement by Xenonetix (on 3. October 2022, 01:10) | 60 | 100 % |
| Folderol by NicoD (on 20. April 2026, 05:30) | 73 | 98 % |
| Zwei Bärenfreunde by berni (on 11. August 2010, 14:16) | 21 | 92 % |
| Die Kryptos - S04E05: U-Bahn unter Hochhäusern by tuace (on 21. January 2020, 08:06) | 49 | 100 % |
| Assorted Sandwiches Sudoku by stephane.bura (on 15. June 2020, 14:37) | 25 | 96 % |
| Avada Kedavra - A Magic Square Killer by Philipp Huber (on 8. July 2020, 22:38) | 73 | 93 % |
| Divisibility Squares Sudoku by ProwlingTiger (on 16. July 2020, 03:33) | 21 | 97 % |
| Archers Defending the Castle by GBPack (on 9. May 2021, 06:41) | 56 | 98 % |
| Intersections Sudoku by RockyRoer (on 16. July 2021, 14:00) | 22 | 93 % |
| Hangover by Realshaggy (on 13. February 2022, 17:03) | 42 | 97 % |
| Valiant Viper in the King's Garden (Chess Snake Sudoku) by Nordy (on 5. April 2022, 01:20) | 33 | 95 % |
| Cavernous Construction by GarlicBredFries (on 5. May 2022, 06:47) | 80 | 98 % |
| Chaos Construction: diagonals by Prutsbeest (on 23. May 2022, 07:00) | 35 | 97 % |
| Full Quads by mormagli (on 7. October 2022, 16:52) | 25 | 97 % |
| Skyscraper Slingshot Sudoku by Piatato (on 2. February 2023, 21:43) | 41 | 100 % |
| Headcrab by Blashyrkh (on 25. February 2023, 23:17) | 21 | 96 % |
