Developers Vertigo Games and Jaywalkers Interactive have announced that Arizona Sunshine made $1.4 million in sales during its first month of release. The zombie shooter was released on the Oculus Rift and HTC Vive on 6th December.

In a prepared statement that was sent to Upload VR, Vertigo Games’ Managing Director, Richard Stitselaar said, “From what we can tell, it may be the fastest selling non-bundled PC VR title to date.”

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This information also gives us some insight into the potential split between Vive and Rift gamers who have played Arizona Sunshine. Using SteamSpy data and assuming a typical sale value of $40, we can estimate that of the $1.4m total revenue, a staggering $1.1m came from Vive users with only $300,000 ($0.3m) from Rift. This suggests a ratio of 3.6 Vive users for every Rift user.

Arizona Sunshine will be released on PlayStation VR later this year.