GOD MODE(and unlimited jet pack)

UNLOCK ALL DOORS(all switches will look like they are locked but they are not so do not flip them)

GET EVERYTHING(will give you all of the guns,keys,and inventory)

WALK THROUGH WALLS(in some cases you may have to restart level)(make sure that the wall has something on the other side)

SHOW FULL MAP(shows the full map of the level when you look at the map)

I THINK THAT THE BEST OF THE CODES IS