Valkyrie Profile: Covenant of the Plume is a nice addition to the DS RPG library that will make you want to sin again and again. The game is somewhat short, but alternate endings make this one RPG worth the runback. Valkyrie Profile suffers from poor enemy AI at times, but it's not too much as to make the game overly simple. The sin requirement alone will add a level of complexity to counter-balance the poor AI. This may be a turnoff to some gamers, but it does create a nice dynamic that plays into the overall Covenant of the Plume tale.