As part of a player's Xbox Live Gold subscription, one or more games are offered for players to try out during Xbox Live Gold Free Play Days. The Free Play Days tend to run over a weekend, and this weekend is no exception. Available now, Xbox Live Gold members can try out Metro 2033 Redux, Metro: Last Light Redux, and Override: Mech City Brawl.
During the Free Play Days, players can unlock achievements. While the games are available to try in their entirety, both Metro titles have estimated completion times of 20-25 hours, while Override only seems to be marginally quicker at 15-20 hours, so be aware that you're unlikely to get the full completion in a weekend. The free trial lasts until 11:59 PM PST on January 20th. You can start downloading them from here.
If you decide you like the games and want to play them after the Free Play Days are over, all three are currently on sale. Both Metro games are discounted by 75%, while Override currently has a 35% discount. Your progress will be carried over into the full game if that's the route you choose.
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