The races are developed in diverse circuits mounted in varied stages, and there are several modes: Grand Prix, individual race, time trial and persecution.
The game is very fun, with the novelty of having some tricks and extra elements that can be used to throw the opponents out of the circuit when they can not be overcome cleanly.
The graphic quality is acceptable and its music very nice. The only counter is that you can not play online online, but as it stands out in its official site is in development stage that functionality.
SuperTuxKart 0.8 is the latest version, updated in December 2012. It can be run on GNU / Linux, Windows, MacOSX, FreeBSD and Solaris. It's free.