Ragnarok Battle Offline, or RBO, is a beat 'em up game for Microsoft Windows created by dōjin soft developer French-Bread. The soundtrack is composed by Raito of Lisa-Rec. It is a homage and a spoof of the MMORPG Ragnarok Online created by Korean developer Gravity Corporation.
RBO impressed Gravity Corporation so much that it has been given an official release outside of Japan. Released as Ragnarok Battle, the game has been distributed in Indonesia, Taiwan, Thailand and a deluxe package in Korea which comes with its own gamepad. Level Up! Games also released an English version of RBO available in the Philippines. However, this release is based only on the initial version of RBO, which does not include the expansions released by French-Bread. There is also an unofficial, fan-made English translation patch available for the Japanese version.
Though primarily a beat 'em up game, RBO also contains some RPG elements. The player creates a character from one of six basic classes and one unlockable class, allocate points to the character's stats and skills, and then enter one of the stages. Up to 3 people can play at once, using the keyboard, joysticks or gamepads.
The game had three expansion packs, called "Extra Scenarios". French Bread possibly planned to have more (since there are unused map icons), but no announcement has been made about another expansion pack for more than two years.