I've been able to get to level nineteen pretty easily just playing local splitscreen with my room mate. We just camp out in the start room until level five and around 3,000 points apeice. then we go upstairs. we both grab the trench guns off the back wall and he holds the front stairs and the window right next to them and i hold the back three windows. We always try to leave al least a crawler alive so we can take our time with the box and repairing all the windows. Around level 7 we go back down the front stairs and open the help door and try for ray guns. rinse and repeat. If i ever end up with the flamethrower i just stand at the top of the front stairs and torch anything, by the timne they make it up the stairs they are falling at my feet. i always try to leave the debris on the back stairs until we are both in trouble. once you open it you always seem to get floods of guys from there. you can try thove above mentioned tactics or instead of opening the help room in the frist room, leave it closed and access it from the rear stairs on the second floor. good luck.
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