To turn the valve you have to hold R1 and L1 (default) and turn the remote control to the way the arrow points. If this doesn't work try R2 and L2.
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no but killzone 3 will have campaign co-op
no
Killzone isn't out on the Xbox 360 so I doubt it will come out on the PC.
KillZone 2 is not only online. It has both a single player campaign, and an online campaign. It also has a lot of achievements.
Absolutely, KILLZONE is split-screen for multiplayer. one screen on the top and another on the bottom. to guy above... where did you get that info? killzone 2 has NO SPLITSCREEN at all... im pretty sure your talking about the 1st one.