All Weapons:
At the title screen, press Left, Right, Up, Down. Then hold Z
and press Right, Right, Left, Left. When the game begins, press A+B+R.
You will hear a noise if it is done correctly (it only works in One-player
Mode).
Level Select:
At the title screen, hold Z and press Right, Down, Down, Right. Release Z
and press Right, Up, Down, Left, Left, Up, Right, Right, to finish code.
Refill Health and Ammo:
Press A+B+R button while playing (you can only use this code if
you have All Weapons on).
