X3: Reunion, developed by Egosoft, is an action-packed game set in a science fiction world that includes over 100 interconnected star systems. The game follows the protagonist, Julian Gardna, a space pilot, who has to uncover the reasons behind the Kha'ak invasion and restore the jump gate that leads to the original Earth. The game offers an open-world environment, where the player can freely explore the universe and follow the storyline or side quests.

The gameplay of X3: Reunion is engaging and immersive. The player controls the main character's starship and can change the ship as per the mission requirements. The player can also mine and trade resources, compete against AI players, and earn money and status. As the player improves their reputation with various factions, new ships and upgrades are unlocked.