Click once on the color block you want to use, then click again where you want to place your block. You can hold the mouse down to lay lots of blocks at once. Use white as an eraser. Press c to clear the screen. Press n to check out backdrops Press m to go back to a clear background If you are coding this project be really careful with the order of operations on the x and y position: there are lots of blocks stacked together!
Thanks Saweron for the inspiration for this one