Janet [Submitted by:Luggs] Start a new game and select a stage. Then at the file screen, hold Start until the mission begins to play as Janet.
Big head mode [Submitted by:Luggs] Beat 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.
Mirror mode [Submitted by:Luggs] Beat 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.
Random mode [Submitted by:Luggs] Beat 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.
