オサワリタンテイナメコ大反芻 (Osawari Tantei Nameko Daihanshoku) is a Nintendo 3DS game developed by Nintendo and released in Japan on April 7, 2016. The game is a mystery adventure game set in a world of mushrooms. Players take on the role of Nameko, a mushroom detective, and must solve various puzzles and mysteries. The game features a variety of characters, including Nameko's friends, enemies, and rivals. The game also features a variety of mini-games and puzzles, as well as a story mode. Players can also customize their character, and the game features a variety of costumes and accessories. The game also features a variety of environments, such as forests, caves, and mountains. Osawari Tantei Nameko Daihanshoku is a fun and unique mystery adventure game that will keep players entertained for hours.