Use the following map names with the "/map [map name]" code:

In the first level after the crash, a zombie throws a scientist through a window. If you
run around the zombie into the lab, you'll see a computer with an ultrasound image. That
ultrasound is of Randall Steward Pitchford III, the son of Randy Pitchford (the leader of
Gearbox Software who developed Opposing Force). He was born on January 8, after the game
shipped!

Approach the Boss of Opposing Force to hear backwards audio composed of the phrase "To win
the game you must kill me Randy Pitchford" when played correctly. Randy Pitchford is the
leader of the development team at Gearbox Software.

Start the "boot camp" and type /noclip in the console to walk through walls. Go straight
through the floor then and you reach a room with the hidden message "DMM 1999". DMM 1999
refers to David Michael Mertz 1999, the creator of the bootcamp.

Use one of the following ammo names with the "/give ammo_[ammo name]" code: