Codemaster's acclaimed 2011 racing game, DiRT 3, is free on PC and Mac through the Humble Store.

All you need to do is snag a Steam code before Saturday at 6pm UK time.

Get ready for DiRT 3 - race over 50 years of iconic rally cars in the snow, rain and dirt or express yourself in freestyle gymkhana events. Featuring the most rally content in the series, experience incredible damage and stunning weather as you race singleplayer, splitscreen and online in multiplayer. Dirt 3 videos - Watch Dirt 3 Macintosh videos, movies, trailers, gameplay clips, video game reviews, interviews and more at IGN.

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More good news: this isn't just DiRT 3, but the Complete Edition of the Colin McRae Rally title. That means it includes all of the game's DLC, adding several new cars and tracks to the game.

Our resident racing expert Martin Robinson loved DiRT 3 back in the day.

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'Codemasters has succeeded in curating another superlative festival of driving,' he said in his DiRT 3 review. 'It's a package more inclusive than any of its predecessors, shot through with the quiet innovations that have defined the studio's more recent efforts. With its off-road events celebrating the series' past and Gymkhana presenting a potentially bright new future, it's another great racing game from an outfit that's proving itself to be a master of its craft.'