I've been wracking my brain to try and figure out why you'd want to do this, and I can't really come up with anything... but I'm going to show it to you anyway because, hey, I have space to fill here.

So if you pop in your Super Bomberman cartridge and go to the Password Screen, you can put in the password "5656"

Which will take you back to the title screen (a little anticlimactic), but then!

Start a game to find

That Bomberman has been shrunk down to pint-size!

I haven't actually figured out how this is useful yet. But once I do, I'll let you know.