Valve’s handheld device, the Steam Deck, wasn’t the first portable gaming PC ever created, but it is by the far the most successful. And like Steam becoming the de facto way people play PC games in 2025,

Lenovo has finally announced a new line of Legion Go handheld PCs, with one that will come installed with SteamOS out of the box. The new model is called the Legion Go S, and it's the world's first handheld PC from a third-party manufacturer using Valve's operating system.

Valve is making a notable shift with its portable gaming strategy as Lenovo debuted a new edition of its Legion Go gaming handheld that runs Valve’s custom operating system.