Before Crytek turned its eye to Far Cry it was working on a science ficiton game called Engalus. The project was shelved, but not until a tech demo did the rounds and an entire script had been produced. Both of these relics, along with a Deus Ex mod showing off some of the gameplay ideas, are available on the website of designer Brian Audette for your perusal. These delights were turned up by the ever-watchful Superannuation.
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