(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 | |
|---|---|---|---|
 | Only Little Killer Sudoku by ICHTUES (on 7. March 2021, 06:00) | 22 |  96 % |
| PatrickRuchti - Kryptosudoku 2.0 by Johannes Quack (on 27. March 2021, 09:23) | 12 | 95 % |
| 真笑Puzzles037--Chaos Construction-- “邹子”002 by cdwg2000 (on 2. April 2021, 15:51) | 23 | 94 % |
| Totem Art by tenaliraman (on 14. April 2021, 15:32) | 19 | 95 % |
| Refraction by grkles (on 28. May 2021, 23:03) | 42 | 94 % |
| The Horse Whisperer / der Pferdeflüsterer by Zombie Hunter (on 12. July 2021, 05:18) | 25 | 90 % |
| Space Battle by Jeet Sampat (on 14. September 2021, 04:38) | 18 | 93 % |
| Boxed In 2: Bigger Box by Cane_Puzzles (on 16. September 2021, 15:20) | 25 | 92 % |
| BL Sandwich by purpl (on 30. September 2021, 06:48) | 17 | 91 % |
| Bicycle 2 [extended XV - virtual sudoku] by SimplePurpleFrog (on 2. October 2021, 05:04) | 18 | 95 % |
| +1 by ICHTUES (on 21. November 2021, 06:00) | 20 | 94 % |
| X-Medians by RockyRoer (on 24. November 2021, 12:50) | 17 | 95 % |
| All My 5s Gone by wooferzfg (on 25. February 2022, 16:00) | 15 | 90 % |
| German Sandwiches by Scruffamudda (on 16. March 2022, 07:34) | 37 | 97 % |
| VIKNA (Windows) by ypkoval (on 27. April 2022, 21:23) | 27 | 94 % |
| Unicycles by starwarigami (on 3. May 2022, 11:04) | 11 | 98 % |
| Entropy and Whispers (Sudoku29) by Sumanta(ANU) (on 16. June 2022, 14:34) | 48 | 94 % |
| Don't Touch by Scruffamudda (on 28. June 2022, 07:54) | 15 | 92 % |
| The Square Wheel by EricRathbun (on 21. August 2022, 16:26) | 25 | 92 % |
| Skyscraper Index by jwsinclair (on 11. July 2022, 19:32) | 13 | 96 % |
