Cheat mode
Press [Down]x2, [Up], [X], [Left]x2, [R], [L], [Start] at the options menu. Return to the main menu and select the "Extras" option to access the cheat and level select functions.
Wireframe mode
Change the Saturn's system date to March 13, 1998 and start the game.
Level select
Enter "HDVMKXVCK" as a password to play level 50. Intentionally lose the level to choose from any previous level.