at the start of the game u see the mainframe activator placed at the bottom of the stairs..open 4 doors(starting from upstairs) which will take u to the theatre..switch the power on in the theatre and link the teleporter in the theatre with the mainframe activator..once you've done that,return to the teleporter in the theatre and teleport(costs nothing to teleport) and it should take u to the pack-a-punch machine upstairs(look up to the chandelier in the theatre,that bunker looking projector room)..the good thing is the 2 doors in the projector room is closed shut which means no zombies can reach u.. but there's a downside,and that is u get zapped to a random room in(i think 15 seconds after u enter the pack-a-punch room) and again zapped back to the theatre..