Resident Evil 6 allows players to select between four scenarios with interwoven storylines. Each scenario follows one of four main protagonists: Leon S. Kennedy, Chris Redfield, Jake Muller and Ada Wong. The player-characters from each scenario will have their own partners who are controlled by either artificial intelligence (AI) or another player via local or online multiplayer. In addition, each scenario features a different play-style; for example, some player-characters are more vulnerable to attacks whereas others are more resilient. Each central character has unique abilities, which vary from increased reload times and carrying more ammunition. Resident Evil 6 presents new gameplay mechanics such as rolling in any direction and running while shooting and sliding. The game also features a four-player co-operative mode. When playing in single player mode, the player can allow another player to join in online at any time. While performing certain actions, quick time events may occur, in which the player must follow onscreen prompts by pressing buttons or manipulating joysticks within a limited amount of time.