NASCAR Racing 4 is a racing simulator produced by Papyrus and released in February 2001. The game was a huge step forward over its predecessor and addressed many requested features for the game. Namely was the introduction of full 24-bit color, as the previous games had only allowed 256, vastly improved car models and environments and, for the first time, the ability of the car to rotate in three dimensions (i.e. the ability of the car to get airborne and flip). The simulator also continued the increased efforts to reflect the aspects of driving a real car.