Sea of Thieves is Microsoft's fastest selling first party new IP of this generation.

[VGPolyglot]

shikamaru317 said:

VGPolyglot said:

Hmm, I think someone could come up with a list, but then again the titles that I'm thinking of I assume aren't considered first-party like Ori and Sunset Overdrive.

No, they're considered 1st party, confirmed by Greenburg. Anything published by Microsoft Studios is considered 1st party.

That is correct all Microsoft Studios titles we consider 1st party.

— Aaron Greenberg 🙅🏼‍♂️💚U (@aarongreenberg) March 28, 2018

I wonder why they even said it as first-party then rather than just saying MS-published.