Starcraft 2: Wings of Liberty Message Board  

How do you get into offline mode? 🤔

You need to connect to battle net servers to authenticate the game once per month, then you can play offline for 30 days.

So log into the game, exit the game, block access to the net for SC2 and you can play offline.

If you don't have a way to block SC2's access to the internet, you can leave the game at the login screen and the game will eventually default to thinking you don't have a connection and ask if you want to play offline.