yes
Killzone 3 is a PS3 video game released February 22 2011 and not playable in PS2
no killzone 1 is one ps2 the killzone retribution is on psp tho
No it is a PS3 game and can not be played on the PS2
I've heard that Guerilla has wanted to make it for the PS2, then make Killzone 3 for the Ps3, but so far KZ2 is just for the PS3.
yes but only the first one
Killzone II is a PS3 game and can not ever be played on a PS2 for a number of reasons. There is not add on updates or anything that will allow a PS2 to Play PS3 games.
When available online play for PS2 is free
Yes
You can not. Some PS2 games can Play Online when the game is in your PS2 and you are connected to the PlayStation network.
yes
no but killzone 3 will have campaign co-op
KillZone 2 is not only online. It has both a single player campaign, and an online campaign. It also has a lot of achievements.