Great Battle! Detective School ~Hidan no Aria~ (大バトル！探偵スクール〜緋弾のアリア〜,Great Battle! Detective School ~Hidan no Aria~?) is a mobile game based on the Hidan no Aria anime. It was developed by Media Factory for iOS and Android devices in March 23rd, 2011, streamed by GREE and then Mobage on June 6th. The game service ended on July 10th, 2012.