The story - the procedurally assembled story, that is - charges you with killing a man who's allegedly responsible for selling arms to both sides of a conflict in a failed state.
Along the way you'll become embroiled in other stories and conflicts, while you either accept missions provided by the game's principal factions, or play both sides against the middle to further your own selfish ends.
"There are no nanosuits in Far Cry 2, and no mutant, alien or magical powers. "Neither the player nor the enemy have any 'powers' other than those that any individual human can summon up in extreme circumstances"
The game takes place in two fully open worlds that are five kilometers on a side, with the second world 'unlocking' roughly one-third of the way through the game. This gives a playable area of 50 square kilometers, through which the player is allowed to freely travel at any time. The story's also non-linear, dynamic and procedurally assembled using a simple drama-management engine to populate the story with key characters and facilitate the convergence of the story toward major climactic events.