Big head mode 
Successfully complete the game on the easy difficulty setting. 
Then, press X, A, Y, B, B, B, Up, Up, Up, Up, Up 
on controller D when the game returns to the "Press Start Button" 
screen. If you entered the code correctly, you will hear a sound.

Mirror mode 
Successfully complete the game on the normal difficulty setting. 
Then, press 
L, Left, L, Right, L, Down, L, Up, R, Left, R, Right, R, Down, R, Up 
on controller D when the game returns to the "Press Start Button" 
screen. If you entered the code correctly, you will hear a sound.

Play as Janet 
Start a new game and select a stage. Then at the file screen, hold 
Start until the mission begins to play as Janet.


Random mode 
Successfully complete the game on the hard difficulty setting. Then, 
press B, Left, X, Y, X, Y, B, A, B, A, Right, Left, Right, Left 
on controller D when the game returns to "Press Start Button" screen. 
If you entered the code correctly, you will hear a sound.