Mortal Kombat X is a fighting game in which two characters fight against each other using a variety of attacks, including special moves, and the series' trademark gruesome finishing moves. The game allows two players to face each other (either locally or online), or a single player to play against the CPU. The energy meter, first introduced in Mortal Kombat (2011), allows players to perform techniques such as "X-Ray" special moves. Similarly to NetherRealm Studios' previous title, Injustice: Gods Among Us, fighters are able to interact with the environment, using parts of the scenery to reposition themselves or using available objects as weapons. In addition, each fighter has three different variations, each featuring a different set of moves they can use during the fight: for example, the character Scorpion features a Ninjutsu variation which gives him specific moves utilizing dual swords, a Hellfire variation which incorporates fiery special moves, and an Inferno variation which allows him to summon hellspawn minions to aid him in the fight.