Hold LMB (mouse) to draw. PEN SNAPPING x key: toggle x snapping (vertical lines) y key: toggle y snapping (horizontal lines) Snapping will force the x or y of the pen to a specific value while you move your cursor. Useful for making straight lines horizontally or vertically. Only one snapping mode may be enabled at a time (x or y). PEN OPTIONS c key: change pen color (0 - 99) b key: change pen brightness (0 - 100) z key: change pen saturation (0 - 100) t key: change pen transparency (0 - 100) s key: change pen size (1 - 100) Note that the default color is 0, brightness is 100, saturation is 100, transparency is 0, and size is 14. CANVAS OPTIONS spacebar + e key: erase the entire canvas. q key: set the background color to current pen settings. Only the color and brightness can/will be accurately applied to the background when changing it's appearance.