Sudden Attack

There are two teams in the game, red and blue. The red team is the Tanzirilo Independence Force, and the blue team is the United Great Force. There are various types of game play matches in different maps. Deathmatch, Destruction, capture the flag, or custom modes (sniper only, pistol only, or knife only). Both teams must satisfy certain conditions, such as defusing a bomb, successful planting and detonation, or achieving a certain number of kills.

There are two types of currencies: Cash and Points. Cash is based on real money and can be charged in exchange for a monetary payment, cell phone billing, or home phone billing and by bank transfer. Points can be earned from playing games. Points and cash can be spent at the in-game shop.

Sudden Attack was developed by Nexon. It was launched on 23 August 2005. It was released during the time first-person shooters were on trend, with competition from Special Force and Karma Online.

By September 2011, Sudden Attack's Taiwanese publisher, Gamon, did not renew its contract with Nexon to operate the game in Taiwan. A few months later, Gamania, which had published many of Nexon's games including Counter-Strike Online, obtained the rights. The game was renamed "S.A. STORM" (Chinese: 突擊風暴). The game's closed beta started on February 22, 2012 and became fully operational on April 18.