Mercy on Mis-Pressing Adjacent Key when in Game Mode

[OzelotVanilla]

What Happened

In the game playing, due to the hard of playing piano game on a keyboard, a player might press the adjacent key wrongly. There should be an option to let the player get that note instead of getting a "missed" finally.

Possible Solution

Times of mercy: allow none/one/two/more continuous mercy.

• Show a warning-representing colour for the press background, and show a arrow (or text, acts as a moving finger warning) to notice the player to move their fingers.
• Or show the moving finger warning on rating text.