I don't suppose there are any passwords or a hidden level select or anything, are there? I unfortunately had the game crash on the caves section :(
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yes on both accounts, the hidden level selector is on the title screen. Enter the konami code you will be sent to the screens that can warp you to any of the levels as well as the sound room. There is also a hidden level in the game. In the reception room press a+B+start or A+B+Y on the x16 version to experience the hr level.