Put together all the parts that your costum vehicle should have. There will be many different parts from several categories: - Frameworks - Engines - Wheels - Guns - Rockets - etc. When you are done constructing the vehicle, test it out and drive it yourself. Not happy? No problem, go back to the workshop for further improvement. But watch out, there are enemies, who will try to destroy your vehicle. Shoot them down with various guns and weapons. You are more of a peaceful person? No problem! Improve your vehicle and try to reach the moon!