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Metal Slug Zero Online was a massively multiplayer online game, part of the "Metal Slug" series. It was being developed by SNK Playmore, THQ, and Sammy Corporation for the South Korean market. There was no word on a Japanese or North American release. The game was on course for a 2009 release, but in the summer of it, developer Dragonfly suspended development of the game due to their belief that the achievement of "Metal Slug Zero Online" being developed by Wiz Hands is far below their expectation, and the game could not conform to the trend of current gaming industry. The online servers for the game ended in 24 March 2013.