Any strategy for playing Zombie level at kino der toten?

Stay in the first room for 4 rounds using only the knife and pistol for maximum points. Make sure you use headsets and work as a team!!!! Then use the bottom route, going left under the stairs, taking it in turns to open doors to save points. Open both doors so u are all outside. Stay in here for 4 more rounds, 2 people at the front guarding the window and main door, and the other 2 guarding the other window and zombies dropping from the roof. Then make your way through the gate and up the stairs, through the next door and all the way down to the back of the stage, (taking it in turns to save points). Once there, DO NOT turn the power on untill at least round 14/15. You only have 2 windows and 1 door to watch so its quite easy with 4 players. Have the M16 from the wall and the first machine gun from outside, (where u make ur first stand). Leave a crawler after level 14/15 then turn the power on, (by this time you should have enough to pimp 2 weapons via the teleporter ). Turn the power on and activate the teleporter. Kill the crawler and EVERYONE get into the teleporter. Do not teleport untill you are over run by zombies. Once teleported, the zombies will gather together so just keep throwing grenades(dont forget to pimp ur M16 whilst in the safe room, it turns it into a fully automatic weapon with a grenade launcher.) When you are teleported back to the first room, run up the stairs and turn RIGHT, open the door, DO NOT open the next door. One of you turn the trap on and let it do its work to save ammo.Make sure one of you is guarding the window behind you at all times. Once the trap runs out, just unleash the fury coz all of you by this time sould have pimped up M16s so it is really easy. Make sure you leave a crawler at the end of the round!!!! At the end of the level, run back downstairs, turn the teleporter on again, and repeat the process (so people who didnt have time to pimp can do so). If by any chance you get over run after the trap, open the other door and run downstairs and do the usual running round in circles. You should get to at least round 30 without having to do this. Happy hunting