To be fair,it's "shipment" not "sold" and horizon is an exclusive title.
Well, now I want to analyze this:
PS4 has roughly a 2:1 lead on X1, so it's safe to say that MHW is at least 66.6% on PS4. That means 5 million on PS4 alone. While it hasn't matched Horizon yet, Horizon also had a one year head start and World has closed about two thirds of the gap in 2 months.
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