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Double XP is a game pass added in the March 11th, 2019 update. It costs 500. It can be bought from the Roblox website, on the in-game phone in the Cash app, or by talking to the Prisoner NPC next to the prisoner wearing a Dominus Aureus.
This game pass doubles the XP earned from completing certain tasks, such as completing a heist or killing a player, but it will not double XP purchased with Robux.
It is the second most expensive game pass in the game, being beaten by the VIP game pass which costs 1,000.