The "CO" in your snippet likely refers to the game's , which is a core part of its design:
: You can hunt monsters with up to 4 players online as members of the Hunter's Guild. The.Incredible.Adventures.of.Van.Helsing.III-CO...
You can find the full evaluation of these features in the Co-Op Review on Co-Optimus . The Incredible Adventures of Van Helsing III on Steam The "CO" in your snippet likely refers to