1. Is Killzone 1,2 or 3 free roam? (if no, are the worlds/levels quite big and explorable like Bioshock, at least?)
2. Do I need to play them in any order? Or can I just go to Killzone 3?
3. Is the trilogy pack worth buying?
1. Pretty linear, some of the areas are large enough to give you some tactical options but nothing like Bioshock
2. There is a story but its largely uninteresting, so I would say play it in whatever order you want
3. IMO absolutely, some of the best shooters on the ps3 and MP is a lot of fun in KZ2 and 3 --- A Ducati and a track to run it on....Heaven http://i36.photobucket.com/albums/e27/DrGonzo615/CP__1021.jpg