One of our favorite Windows Phone games, the miniature car racer 'OverVolt: crazy slot cars', has a special promotion during the holiday period where its premium version, which normally costs $2.49, will be free.

The premium pack gives players access to two extra worlds in the game, along with unlimited multiplayer, 5,000 credits, and a way to save your personalized car texture. It's a nice promotion for a game that's a lot of fun to play.

Download OverVolt: crazy slot cars from the Windows Phone Store

QR: Overvolt