Animal Crossing promotional hints
The production company behind Detective Conan releases various commentary, hints, and teasers about upcoming manga cases and movies in the Nintendo 3DS game Animal Crossing: New Leaf. These hints, which appear to be written by Gosho Aoyama himself, started appearing in January 2014 and have continued through the present day. Players can receive these hints in-game by interacting with four characters named Spade (スペード), Heart (ハート), Diamond (ダイヤ), and Clover (クローバ), who appear in Gosho's Dream Town. These four characters are dressed up to look like various Detective Conan characters, namely Conan, Ran, Haibara, and Kaito.
With the release of Animal Crossing: New Horizons on the Nintendo Switch in March 20, 2020. Gosho began using the game alongside New Leaf for giving hints.