In the first level, when you fight the 3 aliens @ once, go behind the pillars until you find a grate, shoot it and enter, go through the tunnel and activate the switch to enter the strip club.

On the first boss the (the pig one) if you have the rocket loncher with heat seaking rockets shoot him tn the back of the tank there will be a red flash on the back of the tank and his helit will go down faster. Heres another cool tric on the scorpeion boss dont go out where the scorpeion popes out. yoll see the scorpeion so shoot him until his health goes down. a faster way to kill him inter the action mode down, down,a,z,z,left,a.