Various cheats
     Enter  these  at  the console. To get the console, right-click on
sof.exe  in  your demo directory and choose "Create shortcut" and then
right-click  on  the  shortcut you've created and choose "Properties".
Change the command line to add this: +set console 1

It should look something like this when finished:
"c:\....\SOF Demo\sof.exe" +set console 1

Bring up the console by pressing "~":

Cheat code:             Result
god                     God Mode
noclip                  Walk Through Walls
notarget                Enemies Don't See You
timescale               .4 Slow Motion
givemoretutorial        .44 Gun
givesnipertutorial      Sniper Rifle

Spawn Items
     You  may  also  type  these  commands  in the console to activate
various weapons/items:

SPAWN ITEM_WEAPON_assault_rifle
SPAWN ITEM_WEAPON_pistol
SPAWN ITEM_WEAPON_pistol2
SPAWN ITEM_WEAPON_rocketlauncher
SPAWN ITEM_WEAPON_sniper_rifle
SPAWN ITEM_WEAPON_shotgun
SPAWN ITEM_AMMO_auto
SPAWN ITEM_AMMO_rocket
SPAWN ITEM_AMMO_shotgun
SPAWN ITEM_AMMO_pistol
SPAWN ITEM_AMMO_pistol2
SPAWN ITEM_EQUIP_armor
SPAWN ITEM_EQUIP_c4
SPAWN ITEM_EQUIP_flashpack
SPAWN ITEM_EQUIP_grenade
SPAWN ITEM_EQUIP_light_goggles
SPAWN m_nyc_ebum
SPAWN m_nyc_mskinhead1