Demo Master - 0:20 (the first one)

You'll be given one car, one charge and a house to take down. Plant your charge on the back of the car, in the middle but towards the bottom. Then get in the car, drive to the left of the black rock, around the bend and towards the ramp. Your timing here has to be perfect. You need to jump the car off of the ramp but bail before you leave the ramp so that you can blow the charge and still land on the ground. The detonating charge will blow the car across the gap, through the house and into the fuel tanks on the other side.

Demo Master - 0:20 (the second one)

It's one building against you and 63 missles. The key here is to shoot at hip level as you work your way down the length of the building creating a seam of sorts. When you reach the end of the building work your way back down it shooting through the seam you just made to hit the wall on the other side. Just keep moving and keep shooting and you'll do fine.

Demo Master - 0:25

It's up to you and your heavy walker to take down both towers. Don't just walk up to the first tower and smack it as it will simply fall straight down and then you won't be able to touch the next tower. Instead walk through the tower along the side that faces the second tower so that you take out the side of the first tower that faces the second tower. The first tower may need a small love tap to fall down but once it does it will hit the second tower and all of the explosives around it.

Demo Master - 0:30

For this one you'll have twelve gauss rifle shots and a whole bunch of barrels to take down three towers. The key here is to keep moving and to aim precisely so that you can shoot the barrels into the towers. Moving clockwise from your starting point around the front of the towers seemed to work best but just keep trying until you find the pattern that works best for you.

Demo Master - 0:35

Time to get your rocket launcher on! The toughest thing about this one is that it's hard to tell when the game considers the structure to be "critical" as it's not buildings your taking down but a series of tubes. When the action starts look up and to the left and shoot three rockets where the pipes meet the cliff walls. While you're reloading sprint under the pipes, hugging the left wall while doing so to prevent getting brained with debris. Once you get to the other side, turn around and start firing rockets where the pipes meet the cliff walls. Keep doing so until the structure is critical.