QisTopTier
XisBannedTier
It has one.
Also there are different items and different puzzles throughout this game's dungeons. We get to dublicate ourselves, we can control ghosts (!!!), we can create portals like in DT 1 and later on the Voidwalker is updated in a way that the portals do not only influence space but also time!
I'm counting 3 as everything said is in relation to puzzles which normally means key items