D.O.A.S. - All Services Offline (AddOn) are two levels, an intro and an outro to keep the story going. You can play both levels right from the start and watch both sequences. And there are a few gameplay-enhancements.
FEATURES
The fog has a slight texture
Icons show you where a textbox pops up and where you can interact
Intro and outro
MINIMAL OS REQUIREMENTS
Windows: Win7
Macintosh: OSX 10.9.5
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SCREENSHOTS
Take a small peek into D.O.A.S. AddOn. You find screenshots from the intro, menu and from every world.