Valve is backing major technical efforts to run Windows PC games on ARM devices—the same chips that power smartphones. Although there is no Steam Phone yet, these initiatives signal progress toward bringing PC gaming to mobile form factors. By focusing on Windows-on-ARM compatibility and performance optimization through compatibility layers, Valve aims to let Windows PC titles run on ARM-powered devices and expand Steam’s footprint beyond desktop PCs. The development pace suggests PC games could soon be playable on mobile hardware, while preserving access to the full Steam library. While we wait for official products, this push positions Valve at the forefront of portable PC gaming, with Steam and Windows-on-ARM teams coordinating to unlock new mobile experiences for PC gamers. Stay tuned for updates as Valve and ARM silicon designers continue to advance PC gaming on ARM devices.