Instructions are in-game, but here they are anyway! » Guide the paintbrush with your mouse. « Collect the paint palettes to gain points. » Catch the palettes with stars on them to be shielded for 10 seconds. A star will show up on the paintbrush when you're shielded. « Avoid the broken paintbrushes, they'll take away one of your lives. You have 4 lives. » Try to make it through all of the 4 worlds. Every time you beat a world you'll learn something about watercolor.