Robotic Chess Set. Built by engineer Steve Hassenplug and his friends, Monster Chess is exactly the kind of LEGO creation it sounds like. Measuring 156 square feet, the enormous chess set cost $30,000, used 100,000 elements, 25 NXT intelligent bricks, a laptop, and took a year to construct. The pieces seem like they're playing on their own, and when it's one side's turn, the raised horse legs on the knight pieces move in the air. Webb called the robotic LEGO chess game a regular crowd-pleaser. "It's been at BrickFair AL the past two years and is slated to appear in BrickFair New England, too," he added.