SiN

As John Blade, special security forces commander, you must investigate the source of a drug known as "U4" and why strange things have been happening to its users. Weave your way through 6 missions (24 levels total) of FPS action powered by the Quake II engine, and slowly uncover the truth of what's really going on behind the scenes in Freeport City, and Elexis Sinclaire's secret plots. Your path through the game changes depending on your actions in missions.