Someone dropped the source code for Far Cry 1 on archive.org
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Far Cry 1.34 Complete : Free Download, Borrow, and Streaming : Internet Archive
https://archive.org/details/far-cry-1.34-complete
FarCry 1.34 and CryEngine 1.34 code
Relevevant HN Discussion: https://news.ycombinator.com/item?id=36547801