Press Up(2), Down(2), Left(2), Right(2), Select at the title screen. The word
"Start" will turn to "Animation" to confirm correct code entry.
Press R1(2), L1(2), R2(2), L2(2), Left, Circle, Right, Square, Select, Start at
the title screen. Full equipment will be available during the game. Press
Select to skip the current level.
There is a door in the fifth level that requires a code. The code (6178) is
written on the key that can be found in the previous room. A code is also
required in the ninth level. Enter 2360 at the upside-down triangle in the
center of the level. The exit will then appear on its back.