Pause the gam, then press A 16 times and for one more time for each level. For example, you must press A on first level 17 times, and 21 times on fifth level. This works only for the first run.
Contributed By: KeyBlade999.
Unplug the Zapper and plug the second controller. Now, on the player section screen press and hold Left+Up+B+A on controller 2. If done right, the sound test should appear. Press A+B to quit the soundtest.
Hidden Ending Message
After beating the game 3 times, when the word "Congratulations" appears, press A on the second controller and a hidden message will appear.
Beat the game up to 4 times in a row to see each time a different short ending message. It also varies if you reach the end with the second player.
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