Counter Strike

Method 1: Open The console up in game by pressing the "~" key. Next in line, Type in: Sv_Cheats 1 Cheats are as follows:
Method 2: Also reported you can start the game with the -console command line parameter. Make a shortcut to the game, right click on it and edit the properties to look similar to this:
C:\Program Files\Half-Life 2\hl2.exe" -console
Now during gameplay press ~ to get the console and enter a code below:
Code Effect
god God mode (Server only)
noclip No clipping mode
impulse 101 All Weapons
notarget Enemies don't target you
maps Map list
budda You receive damage, but won't die
hurtme # Damage player by #
impulse 82 Get a Jeep
hud_quickhelp/text? 1 crosshairs on
exec [file] Run script file
developer # Developer mode (#=0, 1, or 2)
cl_drawhud 0/1 Show or hide HUD
cl_enablehud 0/1 Show or hide HUD
showfps Show or hide FPS
npc_create_aimed Make NPC
npc_create Make NPC
picker picker mode
sv_gravity # Set gravity to number #
sv_waterdist # Set vertical View to #
air_density # Set air density to #
dsp_explosion_effect_duration # Set explosion length
mat_numtexttureunits # Limit texture units to #
prop_debug Bounding box debug?
sv_bounce # Set bounce multiplier
sv_stopspeed # Minimum stopping speed set
setang # Set pitch Yaw to #
sv_friction # Set friction to #
sv_maxvelocity # Set Max velocity