Kawaii Koinu 3D (かわいい子犬 3D) is a Nintendo 3DS game developed by Arc System Works and released exclusively in Japan. The game is a pet simulator where players can raise a virtual puppy in 3D. Players can customize their puppy's appearance, play with them, and teach them tricks. The game also features a variety of mini-games that can be played with the puppy, such as fetch, hide-and-seek, and tug-of-war. The game also includes a photo mode, where players can take pictures of their puppy in various poses and backgrounds. Kawaii Koinu 3D also includes an online mode, allowing players to share photos and compete in mini-games with other players. The game is a fun and engaging way to raise a virtual puppy and bond with it in 3D.