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MU Online is a free-to-play medieval fantasy MMORPG. The game features fast-paced combat, quests, dungeons, PvP, castle sieges, and more. Players can choose from the nine classes of Dark Knight, Dark Wizard, Fairy Elf, Magic Gladiator, Dark Lord, Summoner, Rage Fighter, Grow Lancer and Rune Wizard, and participate in a variety of official combat-centric events and prize challenges.