とある魔術の禁書目録
Heroz developed a social card game for Mobage titled "A Certain Magical Index: Struggle Battle", which was published by ASCII Media Works on December 25, 2012. The game was updated to "A Certain Magical Index: Struggle Battle II", but was later announced the end of its service on March 30, 2018. Heroz developed an action puzzle game titled "A Certain Magical and Scientific Puzzdex", which was published by ASCII Media Works in 2014. On January 4, 2019, Square Enix released a teaser trailer that announced their game titled "A Certain Magical Index: Imaginary Fest", which was released on July 4. Sun Electronics adapted the series' arcade game by Fuji Shoji into a mobile game and launched it on December 17, 2020.