With Heat – Dark Tunnels, two new racetracks are added. The Grand Prix of Spain takes you through dangerous tunnels where you must rely on your instincts in the dim light. On the Dutch track, you can fully press the accelerator until a series of treacherous curves demands your utmost driving skill. Experience the racing season of 1965 and use the new front spoiler upgrades to improve your aerodynamics and leave the other drivers behind. Additionally, this expansion includes extra material so that another person can join your races. The base game Heat is required to play.