https://www.gamespot.com/articles/last-chance-for-xbox-ones-free-games-with-gold/1100-6458904/

We're nearly halfway through May, which means the first batch of this month's free Games with Gold on Xbox One won't be available for much longer. Xbox Live Gold members only have a few more days to grab a couple of titles at no charge before they return to their regular price.

From now until May 15, Gold members can download the first of this month's two free Xbox 360 games: the Sega classic Streets of Rage. Like all other Games with Gold, it is also playable on Xbox One through backwards compatibility. Additionally, one holdover from April's Games with Gold lineup--Assassin's Creed Syndicate--will also return to its regular price on May 15.