Open console (Tilde "~" for QWERTY keyboards or key "%" for AZERTY keyboard).
  
  enter : Kingsoft 1
  
to activate cheat Codes.
  
  Then you can use :
  
God 1 = God mode (God 0 to go back in normal mode)
  FullLife = refill Max Health
fly 1 = Fly mode (useful to pass through walls or others obstacles) (fly 0 for normal mode again)
  Reborn = ???