As it turns out, the inspiration came from a 3D map of the Tokyo subway system. In a new Square Enix-hosted interview with Hiroyuki Ito and producer Hiroaki Kato, the pair discuss the inspiration behind their team’s dungeon crawler. It’s a minimalist dungeon crawler that relies on tiles, numbers, and interlocking systems to create a really fascinating role-playing experience. Last month, Square Enix released Dungeon Encounters, a strange and unique RPG directed by veteran Final Fantasy developer Hiroyuki Ito.