The multiplayer introduces a new momentum based movement system, which utilizes thruster packs to allow players to perform slow boosts into the air, as well as perform wall running and sliding, all the while giving players complete gun control. In addition to the Pick 10 class system from Black Ops II, Treyarch implemented a character system called "Specialists", where players can pick from 9 different soldiers, each with either a special weapon or ability unique to them. In a later update, a tenth specialist named Blackjack was added to the game. Blackjack is able to mimic the abilities of other specialists, and is only playable for a short amount of time upon completing a set of challenges. A new "Gunsmith" feature offers aesthetic variations in weapon attachments, allowing various weapon customization combinations. The Paintshop feature allows players to create their own custom prints onto specific portions of a gun, further emphasizing the depth of customization in the game.