Another of the games that Microsoft offers free on the X0 event is the first Crackdown. He is from the Xbox 360, but also backward compatible with the Xbox One and 4K support for the Xbox One X. Unlike PUBG and PES 2019, which are free on weekends, it looks like this game will continue to be available to players.
Microsoft has not yet announced a formal announcement, apparently everything will be heard tomorrow at X0 in the evening.
Crackdown can be activated free of charge in the Xbox360 store.