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Lake Apartments v. 1.2

Ahhh...Summer break. Built especially for those test subjects who have survived 2+ years of testing, these apartment blocks are Aperture way of saying: Thanks. Built on pillars embedded into the lake floor, the complex almost hovers above the acidic goo. So, Test Subjects, Aperture invites you to spend all three days of your summer break here. Then get back to work.

---------Update---------
Generally made the level harder, and added the "floating block"