After some beta tests earlier this month, Microsoft Studios and Iron Galaxy have finally released Killer Instinct on Steam. This version of Killer Instinct comes will all 29 characters, all 20 stages, every character color and skin, as well all single and multiplayer modes. KI players on Steam can also play users on both Xbox One and Windows 10 in Exhibition matches, Lobbies, and Shadow Lords multiplayer, expanding the number of Killer Instinct players to over 10 million.
If you already own Killer Instinct on either Xbox One or Windows 10, you will have to double-dip if you want to play the Steam version. As a bonus to everyone who bought the Definitive Edition of KI on either platform, you will receive every Gold and Terror skin pack for free, along with Shin Hisako, Kilgore, and Eagle.
Source: Ultra Combo