In order to enter the following cheats you will have to activate the console by modifying game shortcut. Right-click on the Half-Life 2 icon on your desktop, select Properties and a new screen should pop up. Add the " -console" parameter (without the quotes) at the end of the target field so it looks similar to this:

"C:\Program Files\Half-Life 2\hl2.exe" -console

Click Apply to save the changes and run the game using that shortcut. Now, use the [~] key while playing to bring up the console and enter the following codes there:


God - God mode (server side only)
Give - Gives a weapon or an Item (see the list below)
Buddha - Reduces your health
Hurtme # - Hurts the player (# is damage amount)
Impulse 101- All weapons
Impulse 82 - Spawns a jeep
Notarget - Player becomes hidden to NPCs
Noclip - Walk through walls (server side only)
sv_gravity # - Set gravity to #
sv_stopspeed # - Set minimum stopping speed when on ground to #
sv_friction # - Sets world friction to #
sv_bounce # - Sets bounce multiplier for physically simulated objects collision
sv_maxvelocity # - Sets the maximum velocity of any moving object to #
sv_waterdist # - Sets vertical view fixup when eyes are near water plane to #
air_density # - Changes the density of air to #

[Thanks to AbsalutCheats for information on how to get the cheats to work.]