At the Overworld Map screen, press Y, Y, Z, Z, X, X, Z, Y, X, Z, Y, X, Y, X, Z.� If done correctly, you'll hear a victorious "Yeah!" This will open up the level right after the one you're on.� You will have to repeat it if you intend to skip further than just one.
At the map screen (the screen you use to travel around the valley) press
Down, Right, Left, Up, Down, Right, Left, Up, Down, Right, Left, Down, Up, Left. If entered it correctly, a voice will shout, "Yeah!" To use this code, pause the game at any time and press
X to refill your health and ammo for all your weapons.
You can use the Horus Feather to jump high in the air. To do so, jump and hover just above the ground. Now look down and throw a grenade. The resulting explosion will hurl you high into the air. You can also do this by standing near a wall and using your Cobra Staff.
