When the game over screen appears enter the following command to continue where you left off:
Effect Code Continue from where you died. Press left, right, down, up, hold select and left.
At the title screen enter the following code to access the sound test.
Effect Code Sound test Press and hold I and II then press the run button
When entering your initials on the scoreboard enter 68K and you'll have unlimited continues as long as you don't change it.
Effect Code Unlimited Continues Press and hold Select and enter "68K"
Play the game, get a high score and get a game over. Do this five times. At the name entry screen input the same name all 5 times. When the hi-score list is populated by the same name, the game will be in hard mode.
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