At the title screen, hold B and as soon as the first "P" letter of "MAPPYKIDS" (the 3rd letter ) blinks, press A. If done right, you'll start with 20 lives.
Contributed By: ReyVGM.
Debug Mode *updated*
Note that this cheat may take several tries to execute, as what you're doing is holding the buttons to raise internal counters that increment about 30 times per second to a specific range - if you fail, just reset the console and try again. There are four specific counters, corresponding to four different effects. After any of these are executed, press Start to end the entry of the code.
Effect Code 20 Extra Lives Hold B on Controller 1 for around 4 seconds. Level Select Hold A on Controller 2 for 4~5 seconds, then B for 5~7 seconds, then press Start on Controller 1. Level Select + 765,000 Yen per player Hold Select on Controller 1 for 5~8 seconds after executing the Level Select code, but before pressing Start. Sound Test Hold the A Button on Controller 2 for 5-7 seconds, the B Button on Controller 2 for 3-4 seconds, and Select on Controller 1 for 4-5 seconds.
Contributed By: KeyBlade999.
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