Cthulhu 500 is a motor racing-themed card game designed by Jeff Tidball based on H. P. Lovecraft's Cthulhu Mythos.
Players compete by racing Cthulhoid vehicles (such as the Sports Cthutility Vehicle or the Car of Cthulhu) and take turns either upgrading the vehicle or pit crew, or attempting to overtake the car in front.
The player with the most laps when the checkered flag card is drawn wins; in case of a tie, the front-most of the tying vehicles wins.
The reviewer from the online second volume of Pyramid stated that "Attention, racing fans.
Roll down your tailgates, break out the Space Mead, and get ready for high-speed thrills.