Players on a team work together to secure and defend control points on a map or escort a payload across the map in a limited amount of time. Overwatch assigns players into two teams of six, with each player selecting from a roster of over 20 characters, known in-game as «heroes», each with a unique style of play, whose roles are divided into four general categories: Offense, Defense, Tank, and Support. Overwatch is a team-based multiplayer first-person shooter video game.