Corporate Collapse is the 11th mission of Crysis 2. For this walkthrough, players will infiltrate the Crytek building, swarming with CELL operatives, and then fight with a large, bipedal alien mech machine later on. The mission features a bunch of new weapons, and of course an exciting new enemy in the form of the alien mech.

1. Stay with the Marines as you move towards the objective.
2. When you get the objective update, you can move on your own. Drop down into the water below, and move towards the target building. Take out the aliens to your left and right.
3. You will find a turret near the front of the building, just above the objective. Press F to use it to kill any remaining aliens, and then press V to detach the Turret.
4. Drop down to the parking lot doors below you.
5. Blast open the doors with the Turret and head into the parking area.
6. The parking lot area will have some security guards that you will have to dispatch. If you run out of ammo, resupply from the room directly to your right.
7. Continue clearing the guards towards the elevator. You can stealth here quite a bit of you want, but its quite easy to just take them out.
8. Enter the elevator.
9. Use the elevator switch behind you.
10. When you get to your floor and come out, the large room ahead will be surpsingly empty. Approach the objective terminal and use it. As soon as you do, take cover by ducking behind the terminal, as the room will fill with soldiers quickly. Take them out from behind the terminal, making use of any AOE weapons you have, like grenades and C4.
11. After you clear out the soldiers, use the terminal again.
12. When you get pulled out by the water, head straight into the pipe towards the new objective.
13. Continue going through the pit you're in. You won't be able to jump up to the surface. When you reach the pipe that's far above you, jump up to it; you will be able to climb up the ledge.
14. Jump up to the surface now that it's close.
15. Go to the objective location. You will see a large, bipedal alien mech in front of you. The game will give you a tip to flank it, and attack it from the back.
16. Note: while the game is right to suggest attacking the Mech from behind, this is not at all necessary. It will still die if you attack it from the front, it will just take a lot longer.
17. Pick a heavy weapon (such as the machine gun you got from the parking lot) and run behind the mech immediately. Fire at the exposed red spot on its back. You should be able to unload a full machine gun clip on its exposed spot, after which you should immediately sprint to take cover as it will start focusing its attention on you.
18. Note: use the surrounding environment (the second level of the apartment building and the store next to it, along with everything else) to take up a protected position every time the mech turns around to fire at you, as well as to try and quick get behind it. Another great spot to use is the train wreckage with all the broken concrete. Once again, keep in mind you can fire at any spot on the Mech, but if you get an opportunity to hit the weak red spot, do so.
19. Make sure to pick up the C4 in the store next to the apartment building holdout.
20. You can now use the C4 to get behind the mech and plant it on the exposed spot. Gain some distance before you detonate, as usual.
21. Note: it will also be possible to fire at its back from safety, as it will randomly turn away from you a couple of times.
22. When the mech starts to glow with a red fume, you can finish it off from pretty much any angle quite quickly.
23. Walk over its corpse to pick up 2k nano catalyst points.
24. Gather around the marines that arrive and wait for the mission to conclude.