Your space station lands on an alien planet to explore its rich mineral deposits. However, when you land there you are attacked by the enemy spacecraft. If the rockets from the enemy hit your space station its strength reduces. If the strength becomes zero the game ends. You can destroy the enemy spacecraft by hitting them with your rockets.
Click on the respective enemy images in the control panel of your space station to launch your rockets. When you destroy 50 enemy spacecraft, the enemy launches its final weapon. You can destroy this weapon, and win the game by clicking a particular switch located on your space station, which you have to search.