This page contains Mappy Kids Codes for NES called "Sound Test" and has been posted or updated on Sep 2, 2013 by Lishwish. Let us know what you think of this Code by thumbs voting.
Hold on the second controller the A Button for 5-7 seconds, the B Button 3-4 seconds, and Select on the first controller for 4-5 seconds, then press Start on the first controller. 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.
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