Just Cause 4 is a 2018 action-adventure game developed by Avalanche Studios and published by Square Enix. It is the fourth game in the Just Cause series and the sequel to 2015's Just Cause 3. In the game, the player assumes the role of series protagonist Rico Rodríguez who arrives in the fictional nation of Solís to take down The Black Hand, the world's biggest private military. Just Cause 4 is an action-adventure game played from a third-person perspective. The player assumes the role of series protagonist Rico Rodríguez. 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.