Start the game by running the game from your RUN menu with:
 "C:GameFoldershift.exe" -console 
 
 Now you can bring down the console command box at any time
 during the game with the ~ key (tilde). Now before loading
 a map or game, you must open your console and type
 "sv_cheats 1" (excluding ""). 
 
 Alternatively you may place the command in your
 "C:GameFolderconfig.cfg" file with notepad, so
 it will be automatically set next time you open the game. 
 
 You may now use the following commands (excluding ""): 
 
 "god" - God Mode 
 
 "noclip" - NOCLIP Mode : Fly through walls 
 
 "notarget" - No Target Mode
           
 "impulse 101" - Gives all weapons 
 
 "sv_gravity x" - Adjusts Gravity where when X = 800 the game uses
 default gravity and when X = 0 there is no gravity. 
 
 "sv_accelerate x" - Adjusts air acceleration so you move more when
 you jump. Default = 10 but increase for more effective bunnyhopping :) 
 
 "skill x" - Adjusts skill in-game, 1 = Easiest, 3 = Hardest. 
 "map x" - Replace X with one of the following maps: 
 
 ba_canal1
 ba_canal1b
 ba_canal2
 ba_canal3
 ba_elevator
 ba_hazard1
 ba_hazard2
 ba_hazard3
 ba_hazard4
 ba_hazard5
 ba_hazard6
 ba_maint
 ba_outro
 ba_power1
 ba_power2
 ba_security1
 ba_security2
 ba_teleport1
 ba_teleport2
 ba_tram1
 ba_tram2
 ba_tram3
 ba_xen1
 ba_xen2
 ba_xen3
 ba_xen4
 ba_xen5
 ba_xen6
 ba_yard1
 ba_yard2
 ba_yard3
 ba_yard3a
 ba_yard3b
 ba_yard4
 ba_yard4a
 ba_yard5
 ba_yard5a
 
 Flashlight:
 The flashlight, on any level, does not always work. 
 If yours does not, make your screen resolution larger. 
 If this still has no effect, pause game play, turn it 

Third Person:
Firstly, activate the console. Then, bring it up during gameplay and type 
in /thirdperson. You can now play Blue Shift in the third person.

Where did Gordon come from?!:
Firstly, activate the console, bring it up during gameplay and type in the third 
person command into the console. Notice something? Instead of playing as Barney 
the security guard in the third person, it's Gordon Freeman!

Combat Boost:
When you are transported to the alien world, find the round puddles and stand in 
them. In many encounters, you can save your butt by standing in them and 
fighting. They supply infinite health and when you are injured they will slowly raise 
your health, therefore, you will not take as much damage. (Note there is one 
encounter that will almost require you to do this unless you are an exelent player 
and/or you have full suit health) 

Turn off the Flashlight:
To turn off the flashlight, pause the game and hit your flashlight key.