Talk:Doppelganger/@comment-98962-20130722025121

Seems like you can also access the Doppelganger battle in Part 3--go to the Extras menu, and there should be a little white dot at the bottom of the screen. Click on that, and it should start the scenario. Not sure if you have to have the full combined game or if you can just have Part 3 by itself for it to work, though.