The full Forza game will be available from Thursday 4th September through to Sunday 7th September and will be absolutely free. Nelson stated that:
“In preparation for the launch of Forza Horizon 2 on September 30th, we’re excited to announce that all Xbox Live Gold members can enjoy Forza Motorsport 5 for free this entire upcoming weekend. Beginning at 12:01 a.m. PDT, Thursday, September 4 through 11:59 p.m. PDT, Sunday, September 7, Gold members in Xbox One markets can enjoy Forza Motorsport 5, in entirety and for free.”
As previously stated, gamers will be able to play the FULL game which will enable players to take part in In game challenges and be able to play online, as well as collect achievements and build up their gamer score. If players decide that they want to purchase the game once the free period has ended, they will be able to pick up where they left off using the data from the free weekend.