plz help i am at the sphinx complex revisited,i am in the tunnel straight after the bird,beaker and blade puzzles,it is a red tunnel that i am supposed to climb out of,it's a square hole over my head and i can't get out,i look up and can see what looks like a white tomb stone,if i go back down tunnel it takes me to the level b4 this,if i try to do the cheat it takes me back a level instead of forward,help i am stuck and can't climb out.