Counter Strike: Condition Zero:

Access the console by pressing ` or: ~ and then enter the following:
bot_kill - Kills all bots allowing you to win if the bomb is not planted. 
restart - to restart the map without losing any goals.
 
All Condition Zero: Deleted Scenes:
Bring down the console by pressing ` or: ~ and enter "cl_levellocks 16382" 

Unpatriotic Suicide:
In the Deleted Scenes level, "Alamo" shoot the U.S. flag that is on top of the emabassy and you will automatically die.

Press ~ during gameplay to bring up the console window. Type in sv_cheats 1 then restart to enable cheat mode. When the mission restarts, press ~ again, then enter one of the following codes: 

Effect   -   Code 

God mode - god 
Flight mode - fly
Free movement - noclip
Invisibility - notarget
Get some weapons - impulse 101
Spawn indicated item - give (item name)
List maps - maps *
Change map - changelevel (map name)
Restart round - sv_restart 1 or sv_restartround 1

Item names:
weapon_ak47
weapon_aug
weapon_awp
weapon_deagle
weapon_elite
weapon_famas
weapon_fiveseven
weapon_g3sg1
weapon_glock18
weapon_m3
weapon_m4a1
weapon_mac10
weapon_mp5navy
weapon_p228
weapon_p90
weapon_scout
weapon_sg550
weapon_sg552
weapon_tmp
weapon_ump45
weapon_usp
weapon_xm1014