It used CryEngine 3 and it was based on the original free game Nexuiz .
Nexuiz was a first - person shooter developed by IllFonic and published by THQ for Microsoft Windows and Xbox 360 .
Nexuiz used CryEngine 3 and Nexuiz was based on the original free game Nexuiz .
Nexuiz was a first - person shooter developed by IllFonic and published by THQ for Microsoft Windows and Xbox 360 .