For a list of games, see games using Microsoft Store DRM.
The Microsoft Store (formerly Windows Store) is an app store introduced with Windows 8 and Windows RT. Purchased apps can be used on up to 81 devices for Windows 8 and 8.1 or 10 devices for Windows 10; systems can be remotely removed from this total if they are dead, stolen, or otherwise inaccessible.
Universal Windows Platform (UWP) apps and games require Windows 10 to run, and will not function on another version of the operating system. The similar, but distinctly different, type of apps for Windows 8.x is called Modern UI ("Metro") apps.
Modern UI/Metro apps always run at the desktop resolution and scale correctly to all resolutions and aspect ratios but do not spread across multi-monitor setups. Windows apps require a minimum resolution of 1024x768 (desktop applications can be used at lower resolutions as usual but Windows apps will refuse to launch).