Tom Clancy's Rainbow Six 3: Raven Shield is a 2003 tactical first-person shooter video game developed by Red Storm Entertainment and published by Ubi Soft for Microsoft Windows and Mac OS X. It is the third entry in the Rainbow Six series. The game's plot follows Rainbow, a secret international counterterrorist organization, as they respond to a wave of terrorist attacks threatening South America. Based on Unreal Engine 2.0, Raven Shield is a tactical shooter with realistic properties. Raven Shield moved toward mainstream first-person shooters like Counter-Strike, adapting various features absent in previous versions. These included the ability to see one's weapon while in the first-person view, new weapons and upgrades (including larger magazines and sights), and a revamped multiplayer. A console version, Tom Clancy's Rainbow Six 3, was developed and published by Ubisoft for the Xbox, PlayStation 2, and GameCube. This iteration of the game features the same basic engine, models, textures, and artwork, but with significantly different game mechanics, gameplay, and storyline. A port was also released on Mac OS X on December 19, 2003. Due to the console version's success on the Xbox and the popularity of Xbox Live, an Xbox-exclusive semi-sequel was released in 2004 titled Tom Clancy's Rainbow Six 3: Black Arrow. The next full game in the Rainbow Six series, Tom Clancy's Rainbow Six: Lockdown, was released in 2005.