On one hand you have Rainbow Six Vegas 2 for the PC, a solid and deep tactical shooter with both a 2 player co-op story mode and a 4 player co-op
terrorist hunt mode.
The campaign mode features 2 player co - op. 4 players can co-op in
the terrorist hunt mode.
Not exact matches
While the campaign
mode only features a 2 Player cooperative experience, you are still able to do the
terrorist hunt missions with up to 4 players online.
Once that's done you'll likely start probing the online
modes, teaming up with people for
terrorist hunt, and once your comfortable enough even take it online.
Besides the co-op story
mode discussed earlier, there is also the 4 - player co-op
terrorist hunt.