(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 | |
|---|---|---|---|
 | Viewpoint by Xenonetix (on 24. June 2022, 02:22) | 21 |  97 % |
| Sakurairo [Pencilmark Sudoku] by wisty (on 24. February 2023, 03:45) | 27 | 90 % |
| Killer Clones by arbitrary (on 26. January 2024, 16:24) | 23 | 91 % |
| Is V Greater Than, Less Than, or Equal to 5? (Original) by HalfBakedLunatic (on 6. May 2024, 00:00) | 55 | 96 % |
| Is V Greater Than, Less Than, or Equal to 5? (Revised) by HalfBakedLunatic (on 17. May 2024, 22:36) | 31 | 92 % |
| Foxtrot by zetamath (on 1. August 2024, 18:40) | 26 | 97 % |
| Wrench Heads (Chaos Construction) by Agent (on 26. May 2022, 09:00) | 95 | 98 % |
| Coordi-Loop by Celery (on 5. July 2023, 21:55) | 72 | 97 % |
| Arrow Ratio Sudoku by SudokuExplorer (on 12. January 2022, 00:00) | 42 | 97 % |
| Killer Little Killer Sudoku by Willy Wonka (on 18. August 2020, 15:27) | 48 | 96 % |
| Position Sums mit Pfeilen, "Air Opossum" by glum_hippo (on 24. February 2021, 06:00) | 23 | 98 % |
| Nuribou Sudoku by glum_hippo (on 3. April 2021, 06:00) | 23 | 99 % |
| Baba is Two by FryTheGuy (on 25. October 2021, 07:15) | 24 | 100 % |
| XS-ive Chaos by mathpesto (on 27. February 2022, 03:10) | 48 | 98 % |
| Around the World by antiknight (on 23. March 2022, 20:09) | 24 | 91 % |
| Wichtel 2021 (1): Die Stadtviertel von Pentopia by wichtel (on 26. May 2022, 22:10) | 23 | 94 % |
| Knights & Knaves by ndsurgenor (on 23. October 2022, 12:00) | 22 | 94 % |
| Going in Blind by antiknight (on 8. June 2023, 19:10) | 26 | 97 % |
| U-Bahn with Fillomino enclosures #2 (10x10) by Jesper (on 7. November 2024, 17:49) | 26 | 100 % |
| XV*Magic 7 by NurglesGift (on 10. January 2025, 23:18) | 58 | 96 % |
