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I started the game offline once, and I received a warning about that. I also noticed that achievements were not saved for that session.

What are all the game/metagaming features that don't work while offline?

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up vote 7 down vote accepted

Any achievements you complete (e.g. complete all mission objectives) will not be saved. The mission will still be complete, but you need an active connection to to activate the achievement -- meaning you need to do it again if you lose your connection.

Additionally, while SC2 uses cloud storage to save your saved games / campaign data, this cannot occur while offline. After regaining connection to, your saved games / campaign data should continue to update.

All Challenge maps are available.

Custom games, vs. AI only, are available. (Actually, not 100% sure about this. I think I played a custom game vs. AI while offline)

Edit: Map Editor and testing maps made in the editor also do not require an internet connection (the latter not even requiring you to log in)

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Not true about achievements. I played most of the campaign offline, and shortly after I became online I got all those achievements retroactively. – ripper234 Aug 7 '10 at 10:33
@Kyralessa, while I cannot comment about your individual situation, see questions like:… ,… , and… would indicate that your presumption is wrong. – Raven Dreamer Aug 14 '10 at 21:51

As far as I know, the only limitations for playing offline are:

  • You can't play multiplayer matches (obviously)
  • You can't earn achievements
  • Savegames are not stored via's new online storage feature (so you can't resume the game on another computer in the same level you finished)
  • Stats are also not saved to your account

The rest is the same.

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