If Minecraft smashed straight into World of Tanks you'd get Robocraft. BUILD, DRIVE & FIGHT in this Free-To-Play MMO Robot vehicle shooter.

BUILD - A futuristic robo vehicle from Cubes, add Wheels, Thrusters, Hoverblades, Wings, and Plasma Cannons!
DRIVE - Jump in the Pilot seat of your Robot and drive it into battle in Jet Cars, Tanks, Flying Warships, anything you can dream up!
FIGHT - Battle online in massively multiplayer mayhem against users from all over the world!