(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 | |
|---|---|---|---|
 | Pencil puzzle sudoku hybrid series #3 - Aqre arrow sudoku by Aspartagcus (on 17. November 2020, 17:05) | 22 |  95 % |
| Hugging Arrows (Disjoint Arrow Sudoku) by EliasKar (on 26. February 2021, 15:11) | 25 | 97 % |
| Sudokurotto by Phistomefel (on 15. September 2021, 07:39) | 123 | 99 % |
| The Final Move by kolot (on 28. October 2021, 05:01) | 41 | 98 % |
| Interjunction by MavericksJD (on 8. January 2022, 05:47) | 24 | 94 % |
| Watch my Sandwich by Angelo (on 7. March 2022, 18:22) | 20 | 97 % |
| Trisection by jsmirob (on 15. February 2022, 22:39) | 23 | 93 % |
| Palette Paradise by siron2133 (on 2. September 2022, 18:37) | 22 | 97 % |
| Chaos Snakes by Dag H (on 31. March 2023, 03:35) | 23 | 91 % |
| Build Your Own Killer: Master Designer by Playmaker6174 (on 15. August 2023, 06:00) | 62 | 95 % |
| 4 Choose 2 by Prof.Dori (on 28. March 2024, 14:39) | 23 | 97 % |
| Squishy Deconstruction by Oddlyeven (on 8. June 2024, 14:52) | 19 | 96 % |
| Tentative Scribblings (with sujoyku) by ChinStrap (on 14. March 2025, 16:22) | 60 | 97 % |
| Similar Circles by Md88keys (on 31. October 2025, 05:13) | 24 | 91 % |
| Adventskalender 2018 (Teil 23) - Yajilin by Zzzyxas (on 23. December 2018, 07:00) | 79 | 95 % |
| First Hidden Skyscraper Sudoku (Full Odd) by Feadoor (on 11. February 2020, 15:42) | 45 | 97 % |
| Semi-miraculous Sudoku by clover (on 26. September 2020, 13:00) | 51 | 94 % |
| Cavino Seguito (Canal View Nonogram) by PrimeWeasel (on 18. April 2024, 09:10) | 45 | 99 % |
| Chaos Construction: Miracle on 64 Cells by Playmaker6174 (on 18. January 2025, 00:00) | 83 | 99 % |
| Six in the Fog by oskode (on 29. August 2025, 06:06) | 45 | 93 % |
