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End of the Road
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Start moving forward, sticking to the left so as to avoid the flying rocks and
the lava. As you move along you will see some Parasalophasurs rushing at you,
move to the side and get out your shotgun or rocket launcher. Four of the big
Allosaurus looking dinosaurs are going to come rushing at you. Use the rocket
launcher if you have it and shoot at the ground in front of them to take them
out in one shot. If you don't have the launcher then use the shotgun to flare
them and distract them while you pump them full of lead.

Moving forward you will get a little cutscene showing you a tower and bridge
with a closed gate off in the distance. There are flying bugs here but they are
of no concern for the moment. They're only a threat in large numbers so get
your knife out and start running, and jumping, across the bridge.

As soon as you reach the other side you will be told to get on the turret and
ahelp him take out the bugs. Ignore him and run for the ladder and go up to the
top. From up here, ignore your friend, and start shooting at the bugs. They
seem to have a much harder time hitting you while you are up here so shoot them
until they start hurting you too much. At that point go over to the ladder and
head down it a bit and then jump off.

When you hit the ground there will be a doorway across from you, it should be
open by this point. Run on over to it and go inside and take out your pulse
rifle. Patrol the doorway and kill any bugs that start poking their nose inside
but don't worry about the rest. Restock on ammo while you're in here and just
wait. When your squadmate leaves the room take out your knife and follow him. 
Ignore the bugs again and just run for your life. After a bit of running you
will meet back up with your squad.

Once the cutscene ends start moving forward. A short cutscene will play that
puts an arrow through poor ol' Reese. Your squad will rush forward but do not
move. Wait for a bit and the T-Rex will come charging out, totally distracting
the soldiers. Now jump over the rocks with your knife out and make a break for
the gate to the base.

You are in the base but in more danger than before. Pull out your pulse rifle
and start running forward. Kill any enemies in your immediate path and look for
a ditch. Drop down into it and press against one of the walls. You are shielded
from being hit from all directions while down here so move up and down the
ditch and try to kill every enemy that you can see. Once you think you've shot
everyone you can hit immediately make your way up the ladder and run to the
left, right into the building.

Restock on ammo in here and take out either your pulse rifle or sniper rifle.
Stay to the side of the doorway and lean out, shooting enemies dead. Keep this
up until you think you've gotten them all. Now rush out and drop into the new
ditch. Pull out your knife, kill the raptor that attacks here and immediately
run for the ladder. When you hit the top there's another armory building to the
right, run inside.

Grab up the rocket launcher and some ammo and lean out. Start firing your
rocket launcher at the enemies, blasting the ground or walls nearby to try and
take them out. Use up all of the launcher ammo here except for two shots. Take
out the rest of the enemies and then head out and take the ladder on the left 
wall (facing the doorway) and go on up. Take out all the soldies that you see
and proceed forward.

Follow this ledge along and use your pulse rifle or sniper rifle to start
getting rid of the enemies along your path. There is a turret at the far end of
the platform, a tek arrow, rocket or grenade will get the guy off of it. Kill
any remaining enemies and move forward, to your right is a door. Head inside,
grab some ammo and climb the ladder to find yet more ammo. The next ladder will
lead you to enemies so take it whenever you're ready.

Go up the ladder and turn to your left. There are going to be enemies on both
the upper and lower levels so be careful and take them out carefully. It might
take a bit but now's not the time to die. As soon as you take out the lot of
the enemies a helicopter is going to come flying in. Take out your launcher and
shoot it in the tail as you hide behind one of the walls, one shot is all that
it takes to wipe it out.

Your squad is going to open up the gate behind you so head on through to end
this chapter.