You will have 4 different bikes at your disposal that will change your way of driving with their different attributes. There are those that weigh more (and grip the road better) and those that are faster.
You have a few circuits with different atmospheres to compete and show your abilities. If you are quick enough and you make use of the jumps and turbos, you will win the precious gold trophies.
Super Motocross is an entertaining title, with good visuals, and a simple gameplay. And if that were not enough, it's also free.