Denmark-based toy company Lego has announced its plan to discontinue its buildable educational robot kits, Mindstorms, by end of the year, Lego fan sites like Brick Fanatics and Brickset reported. The Lego Mindstorms kits debuted in September 1998 and the robots could be programmed using the control hubs. The core Mindstorms product line was last updated in 2013.