Killzone 3 Walkthrough - Six Months On: Part 1
5Full Walkthrough: http://www.gamefront.com/killzone-3-walkthrough/
Follow Kowalski as he moves into the jungle. He demonstrates that you can shoot those spiky plants to make them explode, which is handy. After that, you'll have to fight off some giant spiders.
Move on until you hit a cutscene. When it's over, assassinate the nearby Helghast trooper with L1, then take out the guy above your position with a headshot as Kowalski orders.
Stick with Kowalski as he moves up. He'll duck down into some tall grass with you a second or two later — do the same, wait for the patrolling trooper to get close, then blast him in the face or (even better) assassinate him from behind.
Move into the cave. On the other side, you'll see two Helghast stop and converse near some burster plants. Shoot the one in the back on left to blow up the two guys before they can blow your cover
TROPHY: The "Spiky Personality" Trophy is unlocked by killing a Helghast with a burster.
Follow Kowalski. He'll boost you up onto a ledge up ahead, and beyond that you'll hit a cave where you can watch another Helghast patrol get set in the area. Follow Kowalski to the left into another small cave, and assassinate the trooper standing guard there.
From this spot, carefully aim down the sites at the Helghast across the path from you. Put two in his skull to take him out or he'll signal for help.
Get with Kowalski to the next cave, where he'll signal you about two more Higs who are walking past some bursters. Resist the urge to kill them until they stop moving — they'll both go past your cave, stop, and look down the path toward where you just came from. When that happens, just shoot the bursters closest them to take out both.
Stick with Kowalski. You'll see two Helghast below a rock bridge ahead, with one above. The two below start their patrol on either side of a burster, right under the bridge. Hit that to kill them — if they move away from it, wait for them to go back. Then do the same to the bridge guard.
You can just head on from there. You'll hit a cutscene and part ways with Kowalski next. Move down along the ridge and you'll see two Helghast troops talking. When one walks away, assassinate the other.
Follow the second trooper through the dark cave to the bottom. You'll be able to quickly slit his throat, but there are three more guys here so be careful. There should be one on the ground leaving a cave just ahead of you — shoot the burster beside him.
Now carefully put a headshot on the guy on the ledge above the cave, and then look to the left to the cliff side where another guard stands. Pop his skull too, then make for the cave.
At the far side of the cave, look up the ramp ahead of you for another, somewhat more difficult to spot Helghast trooper. Pop him with a headshot and climb up to his position to pass through the cave there.
Full Walkthrough: http://www.gamefront.com/killzone-3-walkthrough/