Hey guys. My younger brother wants me tog et Counter Strike for him on my computer (my mom doesn't really trust him online >___> I researched it a bit, but I found several versions. One was called Source or something like that... is that the best version? Also, do you need to buy the game? Do you need to play for online capabilities? Does it require a good gaming computer, or will mine run it fine? My computer specs: Pentium Â 4 CPU 3.06GHz 504MB of Ram Dual Core Processor Thanks!