Sudden Attack (Korean: 서든어택) is a free-to-play multiplayer first-person shooter online game developed by the South Korean company GameHi. On December 2, 2013, Nexon America CEO Min Kim announced plans to discontinue Sudden Attack North American service. Nexon America terminated Sudden Attack on January 29, 2014. A sequel, Sudden Attack 2 was launched in 2016. By June 2020, the game had over 23 million registered users worldwide and had grossed over $500 million in lifetime revenue. As of December 2021, the game has grossed over $600 million.