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 and was released for PlayStation 4, Windows, and Xbox One on 4 December 2018. 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. The game uses a new version of Avalanche's Apex game engine. The new technology allows the game to feature diverse and extreme weather effects, including blizzards, sandstorms, tornadoes and more. Square Enix External Studios worked with Avalanche for the development. It received mixed reviews upon release, and failed to meet the sales expectations of Square Enix. 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 environment