Cheat mode
Load a game using the hl.exe -dev -console -game gearbox command line. Then press ~ while playing and type in one of the console commands below to activate the desired cheat.

Weapon names
Use one of the weapon names below with the /give weapon_ code above.

Ammo names
Use one of the ammo names below with the /give ammo_ code above.

Ally names
Use one of the entries below with the /give code above to spawn allies specific to the game. They will appear with their own weapons.

monster_otis (Otis)
monster_human_torch_ally (Engineer)
monster_human_medic_ally (Medic)
monster_human_grunt_ally (Grunt with no weapons)

Map names
Use one of the map names below with the /map code above.

Boot Camp:
ofbooto
ofboot1
ofboot2
ofboot2
ofboot3
ofboot4

Regular game:
of0a0
of1a1
of1a2
of1a3
of1a4
of1a4b
of1a5
of1a5b
of2a1
of2a1b
of2a2
of2a3
of2a4
of2a5
of2a5b
of3a1
of3a1b
of3a2
of3a3
of3a4
of3a5
of3a6
of4a1
of4a2
of4a3
of4a4
of4a5
of5a1
of5a2
of5a3
of5a4
of6a1
of6a2
of6a3
of6a4
of6a4b
0f6a5
of7a0

Hints & Tips

Original levels
You can play every Half-Life level that Gordon Freeman went through as Adrion Shepard, but in the lab no scientists will talk to you.

Hidden audio
Come close to 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 right.

Spawn Grunts
First enable cheat mode, then use the impulse 76 code to enable the Grunt-O-Matic. A message to start a new game in order for it to work will be shown. If you want to continue where you are, quicksave, then quickload your game. When you have quickloaded, type in the code again to spawn a Grunt. Note: You need to have the /noclip code on before you spawn the grunt because he will be spawned near you. If this is not done, a message stating that the monster spawned is stuck in a wall may appear and the game will end. Do not spawn the Grunt in a closed position or the same message will be shown. The Grunt you spawn will see you as a enemy. To have more fun, use the /notarget code and spawn several grunts to do your hunting. The Grunts you spawn will look like the Grunts from the original Half-Life.

Fun with spawning
First enable cheat mode, then use the entities code to get a list of the creatures in the area you are in. Normally, when you try to spawn a creature, you have to use the noclip code to levitate in the air and spawn the creature not near an object. If a part of a spawned creature is spawned within a wall, ceiling, or another creature, the game will crash. But if you enable the developer 0 code, the game goes on even if a spawned creature is stuck, but the creature has yellow dots around it. Also, bind the spawn commands to unused keyboard keys; for example bind X "impulse 76" or bind y "give monster_scientist". The impluse 76 code will work everywhere, and the hostile grunts created with it are easy to place where you want; as they appear in front of you, instead of above. Then enable the noclip code and fly around by pressing the bound keys. Now watch as Barney's Aliens and Grunts battle it out while Scientists run around being killed.

Get a gun at the beginning of the level
When your at the beginning of the level where you get to the security guard, locate a chair. It is easily moved. Now move it to the door that he will open for you, and have him to open it. Slide the chair in between the doors, and it will stay open. This could take a few tries. Go out, take the crowbar, charge it up until you get to the same security guard, and hit him until he explodes. Then, grab his pistol with the laser sight and continue.

Hidden health
When you are ready to finish the "package" and are close to going into "Worlds Collide", use the Trans Locator's secondary trigger. You will end up in a cave overlooking a healing pool with two Bullsquids also wanting to go in it. To kill them faster, shoot them with the Desert Eagle. To resume playing, run through the cave until you find a Teleporter Ball.

Set health or damage values of player weapons and enemies in single player mode
Just type sk_ at the console window and press [Tab] to cycle through the values. The sk_plr_ values are for the player's weapons, while other values are for the enemies and health/shield chargers. The 1, 2, and 3 at the end of the syntax matches the difficulty settings easy, normal, and hard. So set their values in view of that. Enter a number, a space after the syntax, then type restart to verify the changes. For example, sk_plr_rpg1 99999 will make the rocket launcher in easy mode cause 99999 damage with a blast radius that wipes out everything in the level.

Redo the sniper course
When your in boot camp, shoot the trainer and you will start again at the beginning of the course.

Give any gun the magnification of a sniper rifle
Save with the gun you want to be magnified. Now switch to the sniper rifle and turn on the scope. When the scope is on, load your previous saved game.

Vortigaunts on the Hazard Course
After you get the Displacer on Xen, use the secondary fire before you pass through the portal to Earth. You will be warped to the Crouch-Jump section of the Hazard Course, where one Vortigaunt will attack the holographic instructor. On the other side of the room is a second Vortigaunt and a shotgun. The exit is in a corner of the observation room.

Killing Gordon Freeman
Go to the map named "of3a1". This is a map where you see Freeman running into the teleporter. Now follow him into that teleporter. After the map is loaded, you will see yourself falling. Usually if you let yourself fall the game will restart at map "of3a1". But if you enable the /noclip and go to the closest platform in front of you, Gordon Freeman will show up. Gordon will stand there with no weapons, and wears silver sunglasses. It takes time to kill him with bullets so try grenades or a powerful weapon. Also you can go to this spot by enabling the map of3a1b code.

See Shepard
Finish the game and wait until the credits are done. After the screen turns black, enable the brightness 9999999999999 code to see Shepard.