(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 | |
|---|---|---|---|
 | Inner Square Diagonals by Phistomefel (on 12. August 2024, 13:31) | 81 |  97 % |
| Chaos Arrows by Sotehr (on 27. September 2024, 15:19) | 42 | 92 % |
| Galaxy Lunchboxes by Undar_Beyond (on 21. June 2020, 13:57) | 38 | 97 % |
| Ma'at's Judgement - The Weighing of the Heart (Chaos Construction) by Chilly (on 22. November 2022, 16:58) | 73 | 100 % |
| Four Colour Theorem by Jay Dyer (on 19. March 2022, 13:12) | 105 | 97 % |
| Kropki Magnetplatten III by tuace (on 12. January 2014, 07:30) | 31 | 99 % |
| Why sooo serious ? [2T1L Deconstruction] by Christounet (on 25. April 2024, 22:59) | 31 | 95 % |
| Pentomino Schleifen (NFF) by Richard (on 8. October 2010, 12:00) | 28 | 92 % |
| Houston by ICHTUES (on 5. September 2021, 06:00) | 23 | 91 % |
| 440 Hz by HalfBakedLunatic (on 19. March 2024, 02:38) | 26 | 93 % |
| ABC-Box Hybrid 1.2: A Beautiful Cave (12x12) by Playmaker6174 (on 10. June 2024, 08:30) | 26 | 100 % |
| Ring Loop by Prof.Dori (on 29. September 2024, 02:09) | 24 | 92 % |
| Sudoku Variants Series (373) - Four Winds Killer by Richard (on 1. June 2022, 01:00) | 52 | 93 % |
| Glyphs #5 by damasosos92 (on 23. February 2023, 23:55) | 49 | 96 % |
| Adventskalender 2023, Türchen 9 - Glashochhäuser by Zzzyxas (on 9. December 2023, 07:00) | 46 | 99 % |
| U-Bahn mit Haltestellen III by tuace (on 28. March 2016, 16:22) | 41 | 97 % |
| Heterochromia (Killer Sudoku) by emmettcito (on 30. March 2021, 00:42) | 52 | 96 % |
| Turn up the Heat by GBPack (on 20. July 2021, 02:50) | 25 | 95 % |
| Wichtel 2021 (10): Eine lange Reise by wichtel (on 8. November 2022, 02:12) | 19 | 99 % |
| BERLIN - Buchstabenrätsel / Letter Puzzle by DocLogic (on 2. February 2025, 17:57) | 21 | 95 % |
