There is a numerous amount of tower defense games out there on the android market, but not one of them compares to Robo Defense. After playing the free version on Robo Defense you will be hooked within minuets. No matter what android phone your using your going to be itching to buy the full version at only 2.99 its a steal for the hours of game play your going to bang out. Ranked at 4 and a half stars and 50,000+ downloads Lupis labs software knew what they had here in one of the best ranked tower defense games for the android operating system. You begin on an open map with one entrance and one exit and you must strategically build your defense to keep the game going your way. As you continue on in the game there are maps that have up to 3 openings on the top and the right of the map making its intense and making you have to pay close attention to your defense. Towers Guns Misses and Slowing towers are all upgradable and can make or break your game but if you decide to stick with one specific weapon you could unlock an achievement like playing the game without upgrading a tower, or playing with only rockets or only guns. With 120 levels Robo Defense is a definite best buy for any of you tower defense fans so go out and buy it as soon as you can!