Robots vs. Zombies is a tower defense game in which you not only build turrets, but also control a mechanical hero. Build turrets, place traps and use your mech's weapons to kill undead enemies as you prevent them from stealing your power cores. Turrets and traps cost upgrade points, which are gained by killing enemies and collecting green orbs. You can manipulate the path of your enemies with your turret placement, but can't block it completely. Also, turrets can't be built on broken tiles. You must save at least one power core to complete a mission. Between missions, you can use purchase items for your mech and upgrade your skills.