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According to Nexon, Dungeon Fighter Online will be shut down for good on June 13th of 2013. The cash shop will be closed on April 11th. From their message:
"Sadly, Dungeon Fighter Online has not attracted enough player interest to properly service the game. Internally, we struggled deeply with the popularity of DFO in North America as the title is immensely popular overseas. For more than three years, we went through many milestones and several pushes before we came to this very difficult decision."
Hell hath no fury like an MMORPG player scorned.