How to Play?

Best Free Defend The Earth Game. Defend the earth is a great aim and shoot game suitable for kids of all ages. Purpose of the game: In this game you have to aim and shoot at invading aliens to save the earth. You have to shoot as much aliens as you can while they shoot to drain your health. As you clear a stage, you regain your health. How to play: The controls of this game are very simple.The main tool to play this game is your mouse. You move your mouse to aim at the aliens and click to shoot. 'P' is used to pause the game. Special Tricks: The special trick to win through the levels is to wait for a while for the alien to stop moving, and then shoot. As you can only take one shot at a time you have to really make sure that your shot hits the target.