A new hybrid system allows the player to lock on and fire at enemies while still controlling the cross-hair. The AI has been rewritten to use a planning system to use the environment to their advantage, take cover and avoid damage.The game uses the Avalanche 2.0 engine, improving upon the engine from the first game.Rico defuses all but one of the missiles, rerouting it, along with Baby Panay, to destroy the oil and end international interest in Panau. In the final mission, Baby Panay launches nuclear missiles at the nations attempting to steal his country's oil stash. Eventually, it is discovered that the island features a great wealth of oil. By completing faction missions and causing 'chaos', Rico uncovers information that leads to Sheldon being absolved from his crimes as the plot shifts to a suspicious international interest in the small nation of Panau. Rico must work with these factions to gain information through helping them in their individual struggles. Recently taken over by Baby Panay, a ruthless dictator, Panau is a violent place.The island features three rival factions: The Ular Boys, The Reapers, and The Roaches. Tom is accused of stealing top-secret intel and millions of dollars from the Agency.

Protagonist Rico Rodriguez, an Agency operative, is sent to Panau to find Rico's former commanding officer and friend, Tom Sheldon.

Since then, the game was delayed once again to its final release date of March 23, 2010. The game was originally slated for release in late 2008 however, it was later announced in October of that year that the game would be pushed back to 2009. Players can perform over-the-top stunts by combining the grappling hook, the parachute, and the ' Stunt Position' system that allows you to mount different areas of the vehicles in the game.

The player takes the role of Rico Rodriguez, an agent of the US government posing as a mercenary, as he takes jobs and tasks for the various rival factions on Panau, a fictitious island nation in Southeast Asia ruled by the dictator Pandak 'Baby' Panay'. Just Cause 2 is a third-person action-adventure sandbox game developed by Avalanche Studios and published by Eidos Interactive and Square Enix.

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