(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 | |
|---|---|---|---|
 | Hurra: Zafer ist 33! by Richard (on 30. August 2012, 00:00) | 48 |  97 % |
| Boxed In (German Whispers Renban Sudoku) by Cane_Puzzles (on 3. September 2021, 17:50) | 63 | 98 % |
| Mut zur Lücke! by Wuschel (on 28. October 2023, 16:14) | 65 | 98 % |
| Cascade by zetamath (on 20. August 2023, 15:43) | 82 | 93 % |
| EnTropic Islands by Paletron (on 1. October 2023, 11:27) | 135 | 98 % |
| DEF Hochhaus anders rum by Luigi (on 13. July 2011, 08:47) | 23 | 93 % |
| Wichtel 2018 (10): HaHeHiHoHoHu by wichtel (on 7. February 2020, 18:20) | 36 | 100 % |
| The Soused Snake by Big Tiger (on 30. June 2020, 02:23) | 16 | 95 % |
| Crossguard Lightsaber Sudoku by Stavros96 (on 29. October 2020, 13:01) | 26 | 94 % |
| Hopscotch by Ish_but_the_1st_time (on 28. February 2021, 20:36) | 13 | 90 % |
| Did someone say Mondrian? by Chilly (on 2. August 2021, 23:27) | 14 | 90 % |
| Middle Ground by Qodec (on 10. August 2021, 15:53) | 39 | 90 % |
| Learn the Alphabet: B is for Between Line by Crusader175 (on 26. January 2022, 17:30) | 30 | 94 % |
| Chaotic Measures by Andrewsarchus (on 1. May 2022, 08:18) | 25 | 99 % |
| Terminal Velocity by Tyrgannus (on 6. June 2022, 17:31) | 36 | 96 % |
| The Demon Watch by Perladel (on 26. August 2022, 14:28) | 24 | 96 % |
| Knights of the Round Table by BenTen (on 17. February 2023, 19:11) | 12 | 95 % |
| I Want More Clues by EricRathbun (on 8. April 2023, 23:12) | 14 | 95 % |
| Known Unknowns by Scruffamudda (on 6. June 2023, 10:29) | 15 | 93 % |
| Battle With The Archers 39: The Lifeline of Three Worlds by Playmaker6174 (on 19. June 2023, 10:11) | 35 | 98 % |
