Defense Math is an online HTML5 game presented by yiv.com, it's playable in browsers such as safari and chrome. You can play the game on smartphone and tablet (iPhone, iPad, Samsung, Android devices and Windows Phone). Hey guys, there are many zombies attacking your home, it's time to kill them! The only weapon you have is a cannon and the only way you can use it is answering the math questions. How long can you survive in this dangerous place? Good luck! 71.19% of 153 players like the mobile game.