Cheat Mode
Press tilde key [~] to bring up the console and then enter the following codes:
iamtheone - Enable cheats
god - God mode
fly - Flight mode
ghost - Ghost mode walk - Disable fly mode
suicide - Suicide
invisible 1 - Invisibility
invisible 0 - Disable Invisibility
behindview 0 - 1st person view
behindview 1 - 3rd person view
slomo - Slow motion
slomo 1 - Disable slow motion