Atlus and Spike Chunsoft are collaborating for an Etrian Odyssey and Mystery Dungeon crossover. Announced during its Niconico live stream this morning, Etrian Odyssey and the Mystery Dungeon is a top-down dungeon RPG due out for 3DS in Japan on March 5 for 6,980 yen.
The game is for “those of you who’ve played 1,000 times” and for “those of you who want to play 10,000 times,” according to the trailer.
https://www.youtube.com/watch?feature=player_embedded&v=ujTUHNpxK-E