The object of the beginning part of Rocky's Boots is to use a mechanical boot to kick a series of objects (purple or green squares, diamonds, circles, or crosses) off a conveyor belt; each object will score some number of points, possibly negative. To ensure that the boot only kicks the positive objects, the player must connect a series of logic gates to the boot. Source: Wikipedia, "[en.wikipedia.org/wiki/Rocky%27s_Boots Rocky's Boots]", available under the CC-BY-SA License.