(See sniper spots below map)  

This level is big, and it takes a while to get to know your way around. Once you generally know the level, it isn't so bad. This level is best with three to four players. If it's only two, it's less fun.

The best area in the Complex is the elevated area that looks out over two different areas, and one area below to drop explosives. If you're using explosives, you'll never run out, because they always regenerate in your "base". Keep dropping bombs down the hole in the floor and down the ramp, especially grenades that bounce around.

If you're don't want to be isolated in that tower, then there are the two other locations which overlook entrances to rooms. You can often catch opponents off guard, but make sure that no one catches you off guard and sneeks up behind you.