City Siege 4: Alien Siege is the fourth installment of the popular, fun-addicting shooting game. You are on a mission on a far away planet. Take your awesome laser gun and build upgradeable troops in order to battle all enemy alien units and rescue the last human survivors. Much fun.
City Siege 4: Alien Siege is a free shooting game available online on Silvergames.com. You can play this cool alien game in full-screen using a web browser like Chrome, Firefox, IE or Safari. City Siege 4: Alien Siege has been already played 87,516 times and received 84 percent positive feedback with 2,674 votes. When you are done with the game, you can play other online games such as Gun Mayhem 2, Strike Force Heroes and Gun Mayhem for free on Silvergames. If you enjoyed playing City Siege 4: Alien Siege share it with your friends via Facebook and other social media.