Level 12 - Epicenter
Go up and slo-mo kill two goons. Take cover in the alcove to the left as you fight the others on the street, and you're taking cover from the sniper down the road. When the soldiers are dead, just go slo-mo and use your ASP to kill the sniper. Now by the subway exit and by a crate nearby is sniper ammo, as well as the gun from the sniper you just killed if it fell. It may be a good idea to toss your shotgun for the sniper rifle because it doesn't make sense to drop the assault rifle.
Now moving up toward the crater in the road there will be four to appear inside it and another sniper up to the left, so take cover and slo-mo kill him, then dice up the Replicas. When crossing the crater, go left and into the building where you can handle the four soldiers on the ground and the sniper above the movie house. I wouldn't swap anything for the laser. And when you enter the theater an armored enemy pops out, so use a single pulse shot on him. Then grab the reflex booster on the side.
*NOTE: Every glowing bomb you see fly and explode on the ground means it's a mech suit, so keep looking in that direction.*
Go down the left side of the theater and go out. Down the road just shoot the power generator above the suit and it will open up for you. Get in and kill the four enemies that appear. When you approach the corner a lesser mech appears to the right along with a missile launcher and some infantry, so send a volley of missiles and pour into them. Then up to the right is another missile guy. Moving up you run into another mech ahead of you, and then another to your right. When you near the next corner another mech will appear, but this one brings a nasty wave of many missile infantry and tons of ground soldiers. The red targets are priorities, or anything above ground, as you can use the light cover in the street to protect against the slow-moving mech. So missiles first, volleys and bursts into the mech, and then clean up the heavy Replicas as your suit repairs.
When you move up this street an Elite Mech suit, the kind you have, will drop in, but he's actually not much tougher than a little one; at least he only fell to one rocket volley and then a few seconds of machine gun fire. Either way just back up as he moves closer and keep firing on him, it's all you can do. Kill a few soldiers, move up the upper right, kill anyone inside, and that is all for this mech adventure. Get out and hop over the wall.
On the street of ghosts you need not worry of attacks, just go to the very end and hop into the pipe. Follow it and you'll end up on a slanted road, which you can just hop over the median if you wish, or go all the way around. Hop down the hole, hop over a wall, and drop into another hole. You can go left to see a road fall, then go right until you see someone. Behind him is the hole to get into the tunnel. Nice and short level, good.