2009-07-03, 05:08 AM
It clearly means Memories = past, Regrets = present and Oblivion = future, because the monsters are getting stronger in THIS corresponding order. Probably the present and future doors are supposed to be shortcuts to those paths but since the monsters that reside in there are too strong or something they unlocked them and left the weakest monsters' door open so you could come in because they mean less threat.