



This game is obviously very addictive, and has all the elements that make a game very attractive. When you play and win or lose the game, you get credit for purchases to upgrade your towers, the next time you play. In this way, the game of tower defense replay value, unlike most other games. This is one reason people continue to use this app, again and again.
ipad:http://itunes.apple.com/us/app/id434604515?mt=8
Iphone:http://itunes.apple.com/us/app/id430151621?mt=8