dude wtf... when i was fighting the red flaming skull thing, it threw me over the god damn barrier and i got stuck. I had to quit, then when i clicked continue story mode it took me back to the 30 seconds Vandheer battle. This game really needs either a save or a restart button.
Finishing this game is a pain in the ass. Luckily, there is a walkthrough on http://guidology.com/2010/08/04/achievement-unlocked-2-official-walkthrough-and-review/
Enjoy!
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