- en.m.wikipedia.org Ragnarok OnlineRagnarok Online is a massive multiplayer online role-playing game (MMORPG) created by Gravity based on the manhwa Ragnarok by Lee Myung-jin.
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- moddb.com games/ragnarok-onlineRagnarok is an online role-playing game based on Norse mythology. Users can create characters and venture off alone or in groups in far-flung fantasy worlds...
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- onrpg.com games/ragnarok-online-international/Combinated with many different job choices this allows characters to be unique adventurers in the world of Ragnarok Online.