Just Cause 4 is an action-adventure game played from a third-person perspective. The player assumes the role of series protagonist Rico Rodríguez.[4] The game takes place in the fictional nation of Solís, a large open world consisting of different biomes including snowy mountains and deserts. Rico can travel the game's world using his wingsuit and grappling hook, whose functions are expanded to include the ability to attach hot air balloons and rocket boosters on objects.[5] A new wind and particle system was introduced, and it affects Rico's traversal with his wingsuit. The game also features a weather system and environmental hazards such as tornados and thunderstorms.[6]
The game features a large variety of vehicles and firearms, including exotic weapons like the Wind Gun and the Lightning Gun. Each weapon also has an alternate firing mode. Players can call for supply drop any time in the game.[7] During combat, he may be assisted by allies who are controlled by artificial intelligence. The game includes a frontline system in which the rebel forces fight against the Black Hand army at the borders of their territories. Rico can participate in these battles at any time.[8]