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The game’s record player numbers were driven by the launch of a Pirates of the Caribbean crossover which arrived alongside Season 3 on June 22.
Titled Sea of Thieves: A Pirate’s Life, the free expansion sees Disney character Jack Sparrow appearing in an original story set across five tales.
At the time it said June 2020 was Sea of Thieves’ biggest month to date, with the game reaching over 3.3 million players.
The pirate-themed co-op multiplayer game released for Xbox One and PC in March 2018, when it became the first exclusive title from Microsoft to launch on Xbox Game Pass day-and-date with its retail release.
A new seasonal progression system was added to the game in January 2021.