Mario Kart remote-controlled cars. Now, this isn't exactly a brand new idea, but Tomy's toys don't just drive around -- they also use power-ups and shoot virtual shells and bananas at one another.
Racers get periodic power-ups, which appear on an LED display on the controller. Each car comes equipped with infrared sensors capable of detecting when they've been hit with a weapon, which causes them to rumble and slow down. Each car will run you 2730 yen (around $30), but your makeshift replica of Bowser's Castle Circuit could cost around $600, depending on how much you invest in the pyrotechnics.