When the title screen appears, press: Up, Down, Left, Right, A, B, A, C, B. Now, go into the options and you'll be able to select the starting stage, invincibility and screen type. Additionally, you can do the following actions while playing:
Code Effect Press Start, then A. Level Skip Press Start, then C. Modify the Color Palette Press Start, then B repeatedly. Step by Step Frame
Start with 9 Credits instead of 4
At the title screen, press C, C, C. No confirmation is shown or heard.
Start with 99 Credits instead of 4
At the title screen, press A, B, A, B, C. No confirmation is shown or heard.
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You can submit a problem report for any non-working or fake code in the lists above.