Debug mode
 
 At the title screen, press R1(2), L1(2), R2(2), L2(2), Left, Circle,
 Right, Square, Select, Start. Now full equipment will be available
 during the game. Press Select to skip the current level.
 
 Animation select
 
 At the title screen, press Up(2), Down(2), Left(2), Right(2), Select.
 If you entered the code correctly, the word "Start" will turn to
 "Animation". 
 
 Hints
 
 On the fifth level, there is a door that requires a code. The code
 6178 is written on the key that can be found in the previous room. On
 the ninth level, a code is also required. Enter 2360 at the
 upside-down triangle in the center of the level. Then, the exit will
 appear on its back.