This Lego robot arm plays free-to-play games while its owner sleeps

3D production director Uli Kilian has found a novel way to earn in-game currency for his favorite free-to-play games without having to lift a finger -- he gets his Lego Technics robot to tap, tap, tap for him. As reported by Wired, Kilian has built a robot arm out of Lego Technics, strapped it to an Arduino board, and programmed it to roll an iPad around and repeat the same sequence of taps over and over to earn currency in mobile free-to-play games. The robot arm currently works with Jurassic Park Builder, a free-to-play game from Montreal-based Ludia Inc. Dinosaurs can be tapped in the game to earn currency, so the arm has been programmed to cycle through each dinosaur, and earn thousands of the game's currency over night. You can see the robot in action in the video above. Kilian says he's looking to make the robot arm work more quickly for similar projects in the future.