Reset Grid Button: Asks you to set a new size for the grid (a x a)
Clear Button: Clears the entire grid.
Progressive Darken: It clears the grid and sets the initial opacity of the grid boxes to 10% and progressively increases to 100% on exactly 10 interactions and then resets back to 0.1.
Color Mode: It clears the grid and resets opacity to 1.
Draw in Black: It sets the brush color to black. (Default is Multi Color)
Custom Color: Lets you choose your own brush color.
Multi Color: Switches back to multi color mode.
When Progressive Darken mode is active, any other brush color selection will have an initial opacity of 0.1. To switch back to full opacity, click on Color Mode button.