Microsoft has announced that in preparation for the launch of Horizon Force 2, set for 30 September, this weekend all Xbox Live Gold members can play the Xbox launch racer One Forza Motorsport 5 completely free. The game will be downloadable in its entirety from 23:00 tomorrow, Thursday, September 4, and you can play it up to 09:00 of 8 September.  At the end of this period, if you continue to play it you can buy the game online through Xbox Store or from your dealer and continue playing from where you left off.