: Development passed from Rogue Entertainment to Gearbox Software , then to Ritual Entertainment , before finally being completed by Turtle Rock Studios .

: This is a standalone series of 18 unconnected single-player missions that were originally part of Ritual Entertainment's development cycle before Valve changed direction. It is widely considered the most enduring and unique part of the Condition Zero collection.

The campaign consists of isolated operations across the globe. Examples of level storylines include:

Standard full releases typically range between 1.3 GB and 1.7 GB. Common Formats:

: A standard USA retail version was uploaded, featuring the "Redump" standard for high-accuracy preservation. September 2022