Level 5: Research
Enter the cave
For those of you keeping track at home, this is the second demo level. Anyone who played it shouldnt have too much trouble finding the path through, although youll still have to take down the dozen enemies that stand between you and the cave entrance thats your first objective.
Sniping is a good way to start. After getting your radar locks on your enemies, whip out your sniper rifle and take down anyone in a position to shoot you. The two soldiers near the mortar by the hut at the top of the hill are good targets; after they drop, get a headshot on anyone who moves. After you get their attention, though, the mercs will start coming around to your location, so keep an eye on your radar. A helicopter will also come by to make a couple of sweeps; if you dont want to deal with it, just wait until it offloads its troops and takes off again. A couple more bodies shouldnt make a difference to a hardened vet like you, right?
When youre ready to move on, start heading around the beach towards the hut on the hill. No need to be subtle, but you might want to use your MP5 on anyone you come across, just to avoid alerting everyone whenever you make a kill. Grab the keycard from the hut and progress down and into the cave.
Take the lift
Before you can ride the elevator to the upper level of the facility, youre going to need to reactivate the power, which a crew of a few mercs is working on down the hallway to the right of the entrance, but before you go, use your binoculars to scout out any soldiers who might be hanging around towards your left. The guys working on the power are apparently somewhat retarded, and dont know that all they have to do to restore the electricity is flip the big red switch on the wall. Kill them, then do it yourself. Actually getting to the lift is the hard part, as theres yet more mercs hanging around the entrance to the lift, and a shortage of light in which to see them, but if you managed to pick up their transponders and can see them on your radar, you shouldnt have much difficulty. If not, you might want to hide in one of the smaller corridors and listen for footsteps until you cant hear any soldier sounds anymore.
After you reach the top of the elevator, simply head for the exit to end the level.
Level 6: Treehouse
Get to the Scientist to help find Val
The building in which you begin has no enemies - at least, no enemies that can actually hurt you. You should get your first good look at some of the Tridgens that youll be fighting later on, though.
When you reach the door leading to the outside, Doyle will radio in with your first objective. At the same time, you should hear a vehicle approaching from your left. The soldiers aboard will be scouting around for you, but if you stay out of sight, they should be distracted by a couple of incoming Tridgens. If the Tridgens dont emerge from the forest, youll probably have to take out the mercs (who are a bit tougher than the previous versions, but drop bits of armor when they die) and then deal with the Tridgens as they come at you. These Tridgens are of the primate variety, meaning that they have no projectile weaponry, but will instead jump and slash at you when they get fairly close. Theyre extremely powerful when they actually manage to hit you, and are fully capable of killing you in just a couple of hits, so engage them from a distance with your M4.
After the nearby threats are dead, youll have to continue on your way to the Supervision building. You have your choice of paths; you can either walk along the suspended platforms among the trees, or grab the 4WD and drive to the entrance. The latter path is a bit easier, and will probably let you arrive at the Supervision building without wasting any ammo, but the path is a bit circuitous. If you can turn the vehicle around and point it towards the jungle, taking every left turn along the path should let you reach the rear side of the Supervision building. You wont be able to get it - all the doors are locked on the ground level - but youll be close to the broken walkway that leads to the buildings roof. Youll probably have to blast a few Tridgens to clear the path, so switch your vehicle over to the rocket launcher and fire at anything that moves. If, on the other hand, you decide to proceed to this area along the walkways, let the mercenaries do the bulk of the shooting, but be sure to take down anyone directly in your path. By the time you get to the enclosed Tridgen zoo, youll probably have to start shooting at the Tridgens on the ground below you in order to clear the path to the Supervision building.