Effectively a gamification of the fandom's favourite pastime (aside from participating in drama), Where's Derpy? 3's title practically explains itself, and in an entirely unsurprising manner it's pretty much exactly the same as its predecessors except with new screenshots to examine. Not that this is a bad thing, of course: there isn't really much that one could add to the formula anyways aside from recreating each scene from scratch in Flash and animating it (which would probably make things even more difficult).