Down Down Dungeon

At last, you've reached the entrance of the Down Down Dungeon! They say the structure inside changes every time you enter, gradually revealing its full form. Try to make it back safely without encountering any monsters—and bring home as much treasure as you can! —description from the publisher ついにだんだんダンジョンの入口にたどり着きました！ この中の構造は入るたびに変わり、だんだん全容が明らかになっていくといいます。 モンスターと出会わず、たくさんの財宝を持って無事に帰りましょう！ —description from the publisher (Japanese)