Half-Life: Poke646 Cheats

Press ~ during game play and enter one of the
following console commands to activate the corresponding cheat
function.

Code
God mode god
All weapons; press [Up] + [Enter]
impulse 101
Spawn gibs and blood impluse 102
No clipping mode noclip
Opponents ignore character notarget
Third person view thirdperson
First person view firstperson

Press ~ during game play and enter one of the following console commands to activate the corresponding cheat function.

Code - Effect:

god - God mode
impulse 101 - All weapons; press [Up] + [Enter]
impluse 102 - Spawn gibs and blood
noclip - No clipping mode
notarget - Opponents ignore character
thirdperson - Third person view
firstperson - First person view