One of my biggest complaints about Killzone 2 multiplayer modes is how the action tends to bottleneck in a few key places on many of the maps. In several maps, there are rooms and hallways where both sides tend to meet, and these make great places to rack up your grenade kills. The only problem is that when you have a steady flow of enemy soldiers coming out of a passageway, you often won’t have time to throw a grenade directly at them without getting gunned down first. What you need to do is approach the door from an angle where nobody can see you coming, and then toss the grenade against the wall inside the room. It should bounce off the wall at a 90 degree angle, which will then put it closer to the enemies inside. I’ve had really good luck doing this, and it’s a great way to quickly clear the room so you and your buddies can rush inside - i.e. super great Killzone 2 multiplayer trick that you need to employ to your advantage.