The Goal of Copy Cat is to copy onto the left canvas the image on the right canvas. Drag a stencil from the right panel to the left canvas, and then click a glob of paint. Paint will go everywhere on the canvas except for under the stencil. The green percentage indicator on the top shows you how similar you are to your target. The red indicator shows how accurate you have to be to beat each level. To get rid of a stencil, drag it to the trash can, or click on the trash can to throw out all stencils.