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For what it's worth, although the post-game content at the end of Mask of Deception is completely skippable, I recommend doing the post-game content in Mask of Truth. There is some stuff in there that is actually plot relevant and provides an extra bit of closure. (on the other hand, some of the MoT post-game stages are actually very difficult -- I wouldn't say they're impossible to beat without grinding, but they're tough)