There is no object to this game. You just use the browser buttons to control a 3D milk truck as it zooms around Google Earth. The truck drives right through 3D buildings, but it will bounce off of mountains and other terrain. Every once in a while, a voice bubble pops up from the truck with different comments.
To play Monster Milk Truck, you need to download and install the Google Earth Web browser plug-in, which is available for Mac or Windows.
Monster Milk Truck is on the Web at www.google.com/earth/plugin/examples/milktruck.