Invincibility cheat:
     Get  to Ahm Shere playing as Rick O' Connell. Go to the middle of
the  area,  pause the game and press Up, Down, Left, R1, R3, Triangle.
You'll  return  to the level and your energy bar should raise and then
remain there.

Imhotep Hint:
     Don't  try  to  use the curse of death on the bosses as it has no
effect on them and you'll end up wasting life.