(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 | |
|---|---|---|---|
 | Build Your Own Sloop by Piatato (on 5. July 2023, 21:23) | 39 |  98 % |
| Blind spot [Narrow Cave Sudoku Deconstruction 9x9] by Christounet (on 23. November 2023, 14:00) | 38 | 98 % |
| A Degree in Thermology by Knickolas (on 26. November 2024, 21:51) | 43 | 97 % |
| Japanische Höhle mit Irrwisch von den Außerirdischen (2) by ibag (on 20. April 2018, 00:00) | 40 | 100 % |
| Daredevil (clone + thermo sudoku) by Aspartagcus (on 4. March 2021, 22:21) | 46 | 94 % |
| Japanese Sum Cave Cipher: Fillomino (Parity) by Niverio (on 18. November 2022, 18:32) | 40 | 100 % |
| Mars Attacks! (2T1L CC) by Xenonetix (on 22. August 2022, 03:33) | 53 | 96 % |
| The Usurper by KMD (on 15. April 2024, 02:09) | 53 | 96 % |
| Offset Chaos by arbitrary (on 29. January 2025, 00:53) | 59 | 99 % |
| Disconnection by fritzdis (on 12. January 2023, 13:43) | 66 | 97 % |
| Chaos Deconstruction: Position Sums by KNT (on 29. June 2022, 16:05) | 79 | 97 % |
| Japanische Arithmetik II by tuace (on 25. June 2014, 17:30) | 38 | 99 % |
| Danke für die tolle Zeit! by ibag (on 10. February 2018, 16:00) | 34 | 99 % |
| The Butterfly Effect by PrimeWeasel (on 5. February 2021, 21:08) | 20 | 97 % |
| Spotlight (Anti-King Arrow Sudoku) by EliasKar (on 5. May 2021, 18:18) | 28 | 99 % |
| Carousel by twototenth (on 10. August 2021, 08:00) | 25 | 99 % |
| Ones and Twos by FryTheGuy (on 9. November 2021, 02:27) | 32 | 96 % |
| Disjoint X Arrows by Mesmer (on 15. October 2021, 20:44) | 15 | 92 % |
| KIIIocator: Ultimate Kill by starwarigami (on 11. November 2021, 03:16) | 15 | 92 % |
| Spiral Galaxy Sudoku with clues by PrimeWeasel (on 13. November 2021, 16:55) | 17 | 98 % |
