We tested with Gears of War 4 and confirmed that the offline features like campaign and LAN multiplayer worked just fine when disconnected. Obviously, online features like buying stuff from in-game stores won't be available when you're offline, but the bit about 'games with network co-op or multplayer features' not working while offline really isn't clear. Additionally, any leaderboards will be unavailable while you're offline.'

While playing offline, some features, such as the ability to purchase additional items from the Windows Store, will not be available. 'Most games with a campaign mode will be playable offline, but games with network co-op or multiplayer features will not work while you’re offline. 'Most games available in the Store on your Windows 10 device support offline play, but check the details of the game to make sure yours is supported by searching for your game at ,' the Xbox support site says. ' Larry Hryb, the man known to the world as Major Nelson, announced on Twittertoday that Microsoft has 'made some backend updates to improve your experience playing 10 games offline.' Basically, if you're going to be somewhere that lacks online coverage-on a submarine, for instance-it will still be possible to play your games.

Most Windows 10 games will support offline play, but you'll have to work at it. Microsoft enables offline play for Windows 10 games