Gears of War 3 - Crater

After a cutscene, a casual stroll, and another cutscene, you leave through the bottom of the tower. You'll be dealing with Lambent wretches and drudges so take a variety of weapons from the supply room. I recommend going with the hammerburst and Retro lancer. Once outside, directly ahead and to the right is a busted wall with a door still standing. Kick in the door and grab the book inside for another collectable.

The next area isn't too bad, just flank up the left side, spraying as you go. After some chat about Dizzy, you'll come to an area that I find rather similar to the "Subway" multiplayer level. You can go into the subway tunnel or you can stay up above. I recommend staying on top because it'll give you better access to the pods on the stalks and set up to flank pretty well. Whichever way you go, when you get beyond the second train car there will be an ammo room on the left side. Bust down the door and you'll have a Retro lancer, ammo crate and a sawed off.

Keep on trucking until you get blocked off from behind and you'll have a small group of Polyps to deal with. You'll come around the corner to find the second of Griffin's towers. Then you'll be promptly attacked. This area is a little tough. You'll be attacked be wretches and drudges from the front (make sure to kill the stalk) as well as being flanked by drudges from behind. Stick to the earlier part of this area where it's somewhat enclosed (or perhaps even pull back some). Nothing special here, just a lot of enemies. Now climb up to the building and enter through the big door.

There's plenty of ammo scattered around here. If you hug the left wall you can bust down a door for a mulcher and if you hug the right wall you'll find the door that leads to the generator. Once the power is on, flip the switch for one of the elevators. And this is Gears so then you back up and aim at the door. As soon as you clear the elevator of the Former, immediately turn back to the rest of the room because they'll start pouring out of the vents as well. Soon you'll hear other elevators coming down. If you hit the Y button, it will warn you as to which elevator is next. The last group will open a door in the back. Grab more ammo and go up the stairs.

Get on the lift and move the car off. As the elevator climbs, there will be some chat and then an interruption in the form of a Gunker (the ones that throw immulsion) who will fall strait through the middle of the ceiling. Just start hammering his heart. It's hard to miss it but he's also going to put you down in one hit so be quick.