Blizzard allows offline play, but you must authenticate while online first.
A refers to one of two things:
required a one-time internet connection to activate the game and link it to a Battle.net account. The Shift to the "Agent" starcraft 2 offline installer
But the megacorps noticed anomalies—brief, well-placed spikes of network traffic that looked for nothing yet carried a payload of human intention. They sent auditors first, then legal notices that smelled of automated templated threats, and finally a team of clean-suited technicians whose job was to sanitize and assimilate. Jax's shop was raided on a sunless morning. For a heartbeat, he feared they'd seize the drive and scrub the archive into oblivion. Blizzard allows offline play, but you must authenticate