Ragnarok Battle Offline (Japanese: ラグナロク バトル オフライン), or RBO, is a beat 'em up 2D game for Microsoft Windows created by dōjin soft developer French-Bread. It is a homage and a spoof of the MMORPG Ragnarok Online created by Korean developer Gravity Corporation. Since 2007 April 14, the game has been digitally distributed through Melonbooks DL.