The Racetrack Key is an item found in Tomb Raider III: Adventures of Lara Croft.
The racetrack key opens the gate leading into the quad bike racetrack within the mansion of Lara Croft in Wimbledon, Surrey. To acquire it, Lara must first open the door leading into her cellar to access the large aquarium. She must then get into the aquarium amongst the fish and find the racetrack key. Outside, all that is left to do is to insert the key into the lock to open the gate.