Hold [Delete] + [F3] during game play.
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Note: An cartridge is required to use the following codes. Change the value of the indicated memory locations to adjust the corresponding game feature.
1. Set to "01" and TFD the same memory location.
Perform the following during gameplay to get their corresponding function.
Press [Tab] at the title screen to display a password prompt. Enter one of the following passwords to begin game play at a new level.