If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Launch the worminator from the earth core in his attempt to reach the surface. He is equipped with a jet pack that he will fuel with gems. There are also some bonus gems that will make him faster than ever. Use your mouse to launch and guide him. Be careful though, there are a lot of obstacles on the way and if you hit them, you may fall in the deadly lava. This is a very addictive game, so have a great time with it!