The Yo-Kai Watch series has spawned a great deal of One-Offs and Spin-Offs from the main series. These games are largely developed by external developers with minimal interaction with Level-5, though some titles have been developed as studio cross-overs between Level-5 and other well-known outfits.
Yo-kai Sangokushi (妖怪三国志, lit. "Yo-kai Three Kingdoms") is a crossover title, paired with Koei Tecmo's "Romance of the Three Kingdoms" series. It is planned for release on the Nintendo 3DS in Japan; no plans have been published for a US release, possibly pending the successful introduction of the main Yo-Kai Watch series in the United States.
Yo-kai Watch Dance: Just Dance Special Version
Yo-kai Watch Dance: Just Dance Special Version (妖怪ウォッチダンス JUST DANCE スペシャルバージョン, lit. "Yo-Kai Watch Dance Special Just Dance Version") is a game developed with Ubisoft as a tie-in to the Just Dance series. Just Dance has achieved a rather large fan-base in Japan, even larger than the US. Due to the popularity of the dance at the end of the anime adaptation, "Yo-Kai Exercise Number One", Just Dance developers Ubisoft approached Level-5 to capitalize on the success and meme-ization of the dance.
Yo-kai Taiso Dai-ichi Puzzle da Nyan
Yo-kai Taiso Dai-ichi Puzzle da Nyan (ようかい体操第一 パズルだニャン, lit. "Yo-kai Exercise No. 1: Puzzle Meow) is a smartphone app that was release on iOS and Android in 2013.
Yo-kai Daijiten (妖怪大辞典, lit. "Yo-kai Medallium") is a smartphone app that was release on iOS and Android in 2015.
Yo-kai Watch: Gerapo Rhythm
Yo-kai Watch: Gerapo Rhythm (妖怪ウォッチ ゲラポリズム) is a smartphone app that was release on iOS and Android in 2015.
Yo-kai Watch: Punipuni
Yo-kai Watch: Punipuni (妖怪ウォッチ ぷにぷに) is a smartphone app that was release on iOS and Android in 2015.