(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 | |
|---|---|---|---|
 | Sandwich/Killer Sudoku - Find x Part 3 by ProwlingTiger (on 27. May 2020, 20:00) | 26 |  94 % |
| Parity Runs #2: Killer by Madmahogany (on 6. June 2020, 14:42) | 41 | 93 % |
| Bomb Sudoku #2 by Rotstein (on 7. July 2020, 05:00) | 16 | 95 % |
| Parity Party XIII, "Power Hour" by glum_hippo (on 30. October 2020, 14:09) | 23 | 94 % |
| Irregular Compoundoku by athin (on 15. January 2021, 07:00) | 14 | 95 % |
| Thermo Sandwich (<>) Sudoku by Cane_Puzzles (on 23. April 2021, 18:00) | 25 | 98 % |
| Decidoku by Innocuous (on 18. August 2021, 01:31) | 18 | 95 % |
| Dance Partners / Die Tanzpartner by Auul (on 13. September 2021, 07:44) | 12 | 93 % |
| Framed Bats by Emphyrio (on 2. October 2021, 18:53) | 22 | 95 % |
| Nonconsecutive Palindrome Sudoku #1 by GBPack (on 24. November 2021, 22:15) | 18 | 93 % |
| The X Days of 12-Mas by Mojo872 (on 1. December 2021, 16:49) | 17 | 90 % |
| Knights & Archers hold the Line by Florian Wortmann (on 30. January 2022, 14:54) | 93 | 97 % |
| Whirlygig (Renban Whisper) by tallcat (on 15. April 2022, 16:59) | 89 | 97 % |
| Odd Turtle Sudoku by Thorsby (on 10. June 2022, 05:02) | 18 | 98 % |
| Throwing Shade by tesseralis (on 19. June 2022, 01:25) | 25 | 98 % |
| Malfunctioning Modifier Mystery by mnasti2 (on 14. August 2022, 15:01) | 34 | 95 % |
| Paint by Numbers by ste221093 (on 19. August 2022, 19:59) | 12 | 90 % |
| Watched (Run-on Renbans) by riffclown (on 12. September 2022, 00:18) | 40 | 98 % |
| Kropki a-lien by chameleon (on 15. October 2022, 02:59) | 17 | 93 % |
| X-Sandscrapers by WedgeOfCheese (on 25. October 2022, 23:01) | 17 | 93 % |
