a digital port of the game's arcade version, titled "killer instinct classic", is available as part of the "season one ultra edition" of "killer instinct" for the xbox one. this port was developed by code mystics and includes a number of additional features, such as a new training mode, unlockable character sprite galleries and cutscenes, several visual filters, and the ability to play the game in both its original 1.4 revision and its later 1.5d revision. an update in late december 2014 added online multiplayer functionality.