(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 | |
|---|---|---|---|
 | The Snake Nest by matt383 (on 9. October 2020, 14:03) | 40 |  98 % |
| The Corners Are Even - Arrow Odd/Even Sudoku by Mr.Menace (on 2. February 2022, 23:04) | 39 | 96 % |
| Quincies by lerroyy (on 11. June 2023, 19:14) | 39 | 92 % |
| Nothing to see here by fritzdis (on 31. August 2023, 09:36) | 35 | 98 % |
| Faultline (Filloku #4) by mormagli (on 12. October 2023, 20:15) | 38 | 97 % |
| grow so natural, i eat my kale by aqjhs (on 17. February 2025, 02:30) | 38 | 99 % |
| A Little Mouthful (Short Sandwiches Sudoku) by Qodec (on 17. January 2025, 23:01) | 37 | 95 % |
| Killer Sudoku - Dirty Tricks by DiMono (on 25. November 2020, 16:27) | 50 | 97 % |
| Fill-a-Renban by SSG (on 23. July 2023, 07:22) | 43 | 95 % |
| Zeta's Nightmare by zetamath (on 15. October 2021, 15:42) | 51 | 97 % |
| The Moving Finger (Numbered Regions Chaos Construction) by tallcat (on 27. February 2025, 03:00) | 160 | 98 % |
| Pentomilin by Myxo (on 16. March 2025, 17:50) | 52 | 98 % |
| Leapfrog by jovi_al (on 9. April 2022, 00:30) | 68 | 96 % |
| Boxed Rooms (Chaos Construction) by thoughtbyte (on 26. August 2023, 13:01) | 64 | 96 % |
| The 4-Colour Theorem by starwarigami (on 5. February 2023, 10:00) | 77 | 96 % |
| Nonconsecutive Killer Sudoku by spxtr (on 1. January 2021, 06:21) | 109 | 96 % |
| Eine Koralle by matter (on 24. May 2015, 08:51) | 30 | 93 % |
| View Through The Window by SudokuExplorer (on 14. January 2021, 00:01) | 29 | 97 % |
| Wichtel 2020 (3): Wichtel beim Glühwein by wichtel (on 10. April 2021, 00:22) | 22 | 97 % |
| Arrows and Palindromes - II by tenaliraman (on 18. April 2021, 21:22) | 27 | 91 % |
