INI file cheats
     Find and open "defuser.ini" in your BioShock installation folder.
Find  the  key  you  want  to  bind  the code to and set the bind (for
example, "F10=god").

     Save  the  file and start the game, while in game press the bound
key to toggle.

     Note: The cheat can be deactivated if a video cutscene appears or
if you move to a new area.

Cheat code:        Effect:
fly                Fly
ghost              Disable Clipping
god                Become Invulnerable/Invincible
teleport           Teleport to Crosshair
walk               Disable Fly and Ghost cheats