Aliens Defense is a free strategy game available online on Silvergames.com. You can play this addicting alien game in full-screen using every modern browser. Aliens Defense has been already played 17,555 times and received 77 percent positive feedback with 356 votes. When you are done with the game, you can play other online games such as Minecraft Tower Defense, Alien Attack Team 2 and Age of War 2 for free on Silvergames. If you enjoyed playing Aliens Defense share it with your friends via Snapchat and other social media.