For the first time, this previously Japanese Namco exclusive is translated officially into English and is available on Evercade! Play as the son of Mappy in Mappy Kids!

Cheats:
20 Lives: 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.
—
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.
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.