Valve is making relatively quick work of going through its entire Steam catalog and testing for compatibility with its Steam Deck handheld, then assigning a rating (Verified, Playable, Unsupported, and Unknown). The list of games verified to work with Steam Deck now spans nearly 1,300 titles. There are some notable omissions, though, such

Source: Hot Hardware – Why Microsoft’s List Of Supported Games On Steam Deck Omits Halo And Gears 5