Anki OVERDRIVE Accessory Rails Kit Use your mobile device to take command of real robotic Supercars in Anki OVERDRIVE. With the Rails Kit, you add walls that keep the battle on the track! Drive the fight into the corners, then slingshot into the straightaways! Rails Kit includes 10 guardrail pieces. An Anki OVERDRIVE Starter Kit and a compatible mobile device are required to play. Expand the battle with expansion tracks, Supercars and the all-new Supertrucks.