CRC Test and Credits
On Player 2's controller, press Up, A, and B, hold them, and reset the console. Release the buttons and the CRC test is formed. If you wish to view the game's credits, during this test, press Right, A, and B simultaneously on the second controller.
CRC Test and Max Level
On Player 2's controller, press Up, A, and B, hold them, and reset the console. Release the buttons and the CRC test is formed. To get the maximum level, press Left, A, and B simultaneously on Player 2's controller. (You must start a new game for this to take effect.)
CRC Test and Save-RAM Check
Note that you need a specially modified NES/Famicom controller; normal ones won't work. With said controller in Player 2's slot, press all four D-Pad buttons down, reset the console, and release the buttons. After you get the message denoting a pass or at-least-partial fail on the CRC test, press the A Button to test the SRAM; if that fails, your Save-RAM (as in your save file) is erased and initialized. If it passes, gameplay continues as normal.
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