Half-Life: Redemption Cheats

Load the game with the "hl.exe -dev -toconsole" command line. Then while playing a game, press ~ to display the console and type "sv_cheats 1" to enable cheat mode. Then, press ~ and enter one of the following codes to activate the corresponding cheat function:
Result
Cheat Code
God mode /god
All weapons with full ammo /impulse 101
No clipping mode /noclip
Opponents ignore character /notarget
Third person view /thirdperson
Adjust gravity sv_gravity [-999 - 999999]
Obtain item /give [item name]
Map select /map [map name]

Close the teleportation door on the lab technician.
He will not open it back up. After teleporting to the mountains,
look to your right. The scientist will be floating. Watch him
for a moment and he will walk in place in mid-air. Note: You
can kill him.

Enable cheat mode, then activate the "/map redE3M5" code to advance to episode 3, mission 5. Locate the door that does not have a handle in that level. Enter the "/noclip" code and walk through the door to find another door covered with smiley faces.

Start the game with the command line parameter hl.exe -dev -toconsole . Now while playing you can press ~ to bring up the console.

It is also reported you can go to the console by pressing ~ then type in sv_cheats 1 instead of having to do the command line parameter above

Invincibility /god
Go to Map (insert map name for name) /map name
Get Item (Insert item name for item) /give item
Weapons & Ammo impulse 101
No Clipping & Flight /noclip
Enemies ignore you /notarget
Third Person view /thirdperson
Give Weapon /give weapon ###
Gravity change Use numbers 10-800 for ## sv_gavity ##