i accidentally gave the game a circle scratch. multiplayer played fine and single player played fine until one of the dens got captured... i couldnt continue the story of sofia without that den. and the scratch prevented me from doing the tower defense.
i didn't know until it was to late that dens could be recaptured by templars, i probably could have advanced further.
some people are to good on the multiplayer mode assassins. guy killed me in first ten seconds and i hadn't even touched the controller