Stuck on the character selection screen after the weekly maintenance.

Blizzard services are in maintenance.

Times when StarCraft II enters maintenance.

The maintenance schedule for the upcoming week.

What to do if you receive one of these errors on the Overwatch website

Times when Heroes of the Storm enters maintenance.

Game cannot be launched because the operating system wouldn't allow the system to write to registry.

Information about an issue where gameplay progress is lost due to a crash, disconnect, or server maintenance.

Blizzard servers could not be reached or may be offline. 

What to do if you log into Diablo IV and your character's progress was lost or reset