Stellaris: MegaCorp is a substantial expansion for the base grand strategy game, requiring the core title to play. Released in 2018, this content shifts gameplay to focus on interstellar capitalism, allowing players to lead a MegaCorp. Core mechanics involve establishing Branch Offices on other empires for profit and developing the Ecumenopolis—a fully urbanized world. It introduces unique economic victory paths and Trade League mechanics, significantly enhancing the strategic depth through commerce and corporate governance.