Sudoku.com Enhanced 作者： derek333x

Keyboard Shortcuts:
- Shift key will turn on or off the note function
- 'd' key will turn on or off dark mode.
-'p' key will pause or unpause the game.
-'e' key will hit the erase button.
-'u' key will hit the undo button.
-'h' key will hit the hint button.
-'c' key will clean up the website (remove side banner, tips, and cookie footer).
-Arrow keys and number keys should work as expected.