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There is a round button with a DNA icon in it in the bottom-left corner of the main menu in the 20th Anniversary Edition.

When I click it the screen dims and a "Back" button appears in the lower-left corner, otherwise the screen is empty.

1) What is this button supposed to do?
2) How to fix my game to make this button work?

I'm on MAC OS X Yosemite 10.10.3
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I think its just a glitch; it's supposed to show the credits for the game and its port. not sure what else i can do here, sorry :(