The Xbox One version of PlayerUnknown's Battlegrounds has passed four million players.
It's an incredible milestone for a game which launched barely a month ago, and which just passed the three million player milestone a fortnight back.
In celebration, all Xbox One players who own the game as of 31st January will be gifted 30k Battle Points to spend on cosmetic crates.
It's not strictly 4m sales - multiple accounts can access a game on any one console - but still a good indicator of how fast the game is still selling. (Very fast.)
This week's Xbox One patch added an auto-run feature, among other fixes and optimisations. The game arrived on Xbox One in need of some more polish - Digital Foundry has been keeping track of its progress.