Xbox Free Play Days: Sea of Thieves Free for Everyone, Hell Let Loose Vietnam for Game Pass Until September 20

Xbox's Free Play Days run from September 17 to September 20, 2026. Sea of Thieves is free for all Xbox owners with no Game Pass subscription required, timed to its new Season 21. Hell Let Loose: Vietnam, a hardcore tactical shooter set in the Vietnam war, is free to play for Game Pass Ultimate, Premium, and Essential members over the same window. Both are play windows rather than free-to-keep, and progress carries over if you buy.