(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 | |
|---|---|---|---|
 | Even The Odd Arrow by tzael (on 28. July 2020, 09:26) | 29 |  92 % |
| Defending Digits (Castle Sudoku) by Mark Sweep (on 14. October 2020, 12:26) | 27 | 96 % |
| Pentomino Loop Sudoku by Quarterthru (on 5. November 2020, 12:00) | 28 | 94 % |
| 9 Cages by PrimeWeasel (on 30. November 2020, 15:57) | 24 | 90 % |
| Zeroth Law of Chromodynamics by twototenth (on 26. April 2021, 13:08) | 89 | 97 % |
| Full Lashing by Joseph nehme (on 1. May 2021, 08:34) | 39 | 98 % |
| Even Hunter by Lisztes (on 16. October 2021, 01:00) | 22 | 92 % |
| Mysterious Lines 2: All WRAPT Up by mathpesto (on 26. September 2021, 17:25) | 30 | 95 % |
| 4'33" by ndsurgenor (on 28. September 2021, 15:35) | 34 | 97 % |
| Key Word (feat. Playmaker6174) by purpl (on 19. October 2021, 17:45) | 19 | 97 % |
| Hinges by jovi_al (on 20. December 2021, 02:37) | 125 | 98 % |
| Out of Line by Andrewsarchus (on 13. January 2022, 09:50) | 17 | 92 % |
| Ironworks by Bremster (on 20. January 2022, 00:08) | 31 | 96 % |
| Battle With The Archers 28: Between Friends and Enemies (part 2) by Playmaker6174 (on 14. February 2022, 02:50) | 32 | 97 % |
| Sudoku Variants Series (362) - Star Sums Sudoku by Richard (on 9. March 2022, 00:00) | 72 | 95 % |
| Code 62 (Hi-five) (Sudoku 22) by Sumanta(ANU) (on 11. April 2022, 13:35) | 33 | 97 % |
| Knuckle O'Sandwich by zegres (on 13. April 2022, 06:33) | 34 | 96 % |
| Squiggles (Grkles Collab) by Niverio (on 15. June 2022, 00:37) | 37 | 96 % |
| Colorguru Chaos Deconstruction: Renbans by crispy16 (on 23. June 2022, 05:33) | 23 | 99 % |
| Kropki-cycle by tesseralis (on 28. July 2022, 12:58) | 19 | 100 % |
