The easiest way to do this glitch is with the Browning.

Simply open the help room with 1,000 points, then wait for the question mark to flash dark gold 46 times.

On the 47th time hit it fast and you should get the Browning.

Once you have that you need to sprint to the pillar under the stairs and and jump and press and hold B.

If you can land on the damaged pillar, only use the right joystick to turn around, then pull out the Browning and start shooting everything that comes through the door way.

Just watch out for your left side cause the glitch only works for the zombies upstairs.