Force close Windows 8 metro apps
1. Apparently Windows 8 uses a new technique that do not require us to close metro apps. It automatically suspend apps and kill them later when the Windows 8 notices you have already finished using that application. Anyway, if you really want to close the metro apps quickly then you will have to close them through the task manager. Press Esc+Shift+Ctrl to open task manager directly or Press Ctrl+Alt+Del and select Task Manager.
2. Next, Select the apps you want to close in the Task Manager and click on the End Task button. That’s all you have to do to close Windows 8 metro apps.