(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 | |
|---|---|---|---|
 | Centripetal Slingshot Sudoku by stephane.bura (on 30. July 2020, 20:00) | 50 |  99 % |
| Pocket Sandwich Sudoku by Genomico (on 1. November 2020, 20:25) | 16 | 92 % |
| Juicebox by TotallyNormalCat (on 18. December 2020, 23:00) | 23 | 96 % |
| Boba by grkles (on 20. April 2021, 18:28) | 30 | 94 % |
| BarQode Arrows (Renban Arrow) by tallcat (on 2. June 2021, 15:52) | 46 | 98 % |
| Anti-Sudoku by HawkAvatar (on 21. June 2021, 14:02) | 14 | 98 % |
| (anti) R5nban Arrow Windoku by Jeroen Panda (on 29. July 2021, 09:44) | 16 | 98 % |
| Kyūdō by thoughtbyte (on 23. September 2021, 04:49) | 17 | 90 % |
| Beyond the Veil by XeonRisq (on 7. November 2021, 02:00) | 15 | 92 % |
| Clasped Cages by Cane_Puzzles (on 5. December 2021, 17:14) | 31 | 96 % |
| Surroundings by PetLov (on 28. September 2022, 21:25) | 16 | 90 % |
| Free Solo by Blashyrkh (on 15. March 2023, 11:51) | 34 | 95 % |
| Dynamic Quiver by Niverio (on 22. November 2023, 18:41) | 47 | 97 % |
| High Way by Mujika (on 6. January 2024, 17:47) | 60 | 93 % |
| Pincer Movements by arbitrary (on 17. May 2024, 00:49) | 78 | 94 % |
| Muddlebug by Tyrgannus (on 17. June 2024, 09:12) | 34 | 94 % |
| Wichtelkalender 2013 - Juli by ibag (on 1. July 2013, 00:00) | 47 | 98 % |
| Popcorn by PulverizingPancake (on 6. February 2023, 17:16) | 55 | 92 % |
| Stolen Numerals XV*3 by NurglesGift (on 6. July 2024, 22:12) | 52 | 95 % |
| Directions by SudokuExplorer (on 23. December 2021, 00:00) | 88 | 98 % |
