The game continued to be popular for years, due to its excellence and the fact that developer Papyrus folded in 2004, making the game's code essentially open source. That allowed individual users to take advantage of the software’s excellent physics engine and create their own expansions and modifications. During its heyday, online players could find themselves competing against some of NASCAR’s finest real-life drivers—including Dale Earnhardt Jr., Denny Hamlin, and more—who found the game realistic enough to use it as a training tool. Today, there are still numerous online series and championships that use NR2003, a game that proved to many that a lot more goes into being quick on an oval than turning left. Car Games It's pedal to the metal in this classic car racing game. Car Games