Dungeon Hourouki (aka Dungeon Wandering Chronicle) is a cancelled RPG that was in development by ASCII for the Famicom / NES. It seems that in the game players were lost in a dungeon of some sort (a prison?) and they had to find a way to escape. An interesting feature of Dungeon Hourouki was its random generated dungeon system, that would have let to explore more than a million different combinations of levels. It’s currently unknown why the game was canned and only few screens were found in a japanese magazine.
Thanks to Celine for the contribution!