v1.8 minor fixes & further modification to level 3.
v1.7 allow SHIFT to be used instead of CTRL for single select (for
Mac users). More explicit hint at start of level 3. Increased scroll
margins to reduce mouse-out frequency.
v1.6 fixes the bug if you finish level 1 while the 'exit' popup is
still visible (thanks whitemang!). Also turned off the preloader
An anonymous office skyscraper in the city. A rogue email containing a
deadly brain-melting cybervirus. One minute you're buried in
spreadsheets and the next you're fighting your way through the undead.
Now you and your co-workers must make a break for the roof and a
helicopter evac - survive at any cost!