(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 | |
|---|---|---|---|
 | Eddies by Qodec (on 12. January 2021, 22:41) | 72 |  99 % |
| Arrowings by kolot (on 25. January 2022, 11:37) | 27 | 96 % |
| Thermo Battle by 10feet (on 18. February 2022, 17:00) | 25 | 98 % |
| Regional Chaos by arbitrary (on 11. January 2025, 19:00) | 24 | 95 % |
| Grouping All but One by Sneppix (on 8. February 2026, 14:31) | 27 | 94 % |
| Dynamic Duos by Niverio (on 22. August 2021, 17:32) | 51 | 98 % |
| The Cross by Tom1i (on 15. December 2020, 15:06) | 62 | 99 % |
| Odd Pentominoes on the Loose by JeffWajes (on 31. July 2022, 05:52) | 31 | 97 % |
| Hoverbike by tesseralis (on 10. July 2023, 04:47) | 33 | 98 % |
| Chaos Destruction X-Sums by lepton (on 18. February 2024, 08:07) | 34 | 92 % |
| Toei Subway by Myxo (on 19. February 2025, 14:05) | 31 | 100 % |
| Dismay (Region Sum Lines Sudoku) by Qodec (on 29. June 2022, 22:50) | 75 | 97 % |
| Roman Whispers (XV German Whispers Sudoku) by Phistomefel (on 31. January 2022, 18:23) | 119 | 98 % |
| 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 % |
| 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) | 47 | 94 % |
| Japanese Sum Cave Cipher: Fillomino (Parity) by Niverio (on 18. November 2022, 18:32) | 41 | 100 % |
| Twin Rooms (Chaos Construction) by Agent (on 14. June 2022, 09:00) | 48 | 96 % |
| Mars Attacks! (2T1L CC) by Xenonetix (on 22. August 2022, 03:33) | 54 | 96 % |
