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The player is free to roam the game"s open world at will, not having to focus on the game"s storyline.

Several new additions and improvements to the game have been highlighted by lead designer, Peter Johansson. The AI has been rewritten to use a planning system which enables enemies to perform varying actions. Enemies can use the environment to their advantage, taking cover behind objects and adapting to the objects around them. Additional elements include vertical gameplay and a manual aiming system.

There are several new weapons in Just Cause 2. There are several new vehicles, including a Boeing 737, with a greater variance in the handling of different vehicles. There is also a real-time deformation system and individual components that can come loose from vehicles.

Initially, the player must acquire weapons and vehicles in the field of their own accord. Early in the game, the player encounters a black market supplier, from whom weapons and vehicles can be purchased, with an option to have them delivered to the player"s location via helicopter drop. As the game progresses, additional weapons, vehicles, and the extraction option become available on the black market. All weapons and vehicles on the black market have parameters that can be upgraded in several steps, by building upgrades with weapon and vehicle components. There are over 2,000 parts that the player can acquire.[7]

Notable features of Just Cause 2 include the dual-grappling hook, which gives players the ability to tether objects to each other. There are no limitations to what can be tethered, allowing tethering of enemies to vehicles. This feature can be utilized in game play situations, such as high speed vehicle chases, wherein the player can use the dual-hook to attach a pursuing vehicle to the ground, immediately forcing it to a stop and causing immense damage to the vehicle.

In addition, the player is given a "re-loadable" parachute which is always ready to be deployed, even if it had been deployed and discarded only moments before. This can be combined with the grappling hook and used for a fast method of transport in a technique known as the "slingshot maneuver".