Select Level- First start a single player game. Play until getting the option to save the game on the controller pack. Save the game, then reset. Select the load game option from the main menu, then choose the game that was saved. A prompt to insert a rumble pack will appear. Hold L + B for approximately one second, then press A. A level selection screen will appear that allows any mission to be played under the current difficulty setting. Note: The difficulty setting may be changed by entering the option screen from the main menu.
Car Mode- At start of game go to the options menu. Then select practice. When you get there first get the guy with the gun out of your way because he might mess you up. After he's dead pick up the car and fly through all the rings even through the last one, you can't simply walk through it. If you successfully did this there will be a glitch in the game and you will be in the car.
Skip to Next Level- Ok, here is a way that will help you beat the game faster. On the title screen press C-Up, C-Down, C-Left, C-Right, C-Up, C-Down, C-Left, C-Right. Then you will hear superman say "This looks like a job for Superman". Then start a new game and press Start and press C-Up, then C-Down.