Mortal Kombat 1 Won't Have Crossplay At Launch - GameSpot

The feature will come later.

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Is Mortal Kombat 1 crossplay available?

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Mortal Kombat 1 Roster Speculation & Discussion Thread, Page 66

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Update: Mention of crossplay as a launch feature has been removed from Mortal Kombat 1's Steam page

Mortal Kombat 1 Won't Have Crossplay At Launch - GameSpot