which teams may need to complete a simple objective such as holding a location while another team attacks. Scenario design A paintball scenario will have often have pre-planning by a director or producer and incorporate a theme - with popular simulations possibly drawn from action movies, military events, science fiction, historical events, or television shows. Games are generally designed for either single day play, which are run over an eight- to twelve-hour timespan during the daylight hours, or 24-hour play, which last for much longer and are more intricate. The entire game itself can be either one continuous match, or divided into smaller skirmishes and missions; with scoring for individual matches contributing to an overall score. Player roles Many scenario games add special roles to the paintball game. Some are strictly for the story line, describing the player as part of the group he or she is portraying. A player may be almost anything to fit the storyline, such as a rebel, an angry villager, a scientist or more. These roles have no effect on how the player plays. Some roles have special game abilities that assist their team. For example, a player could be a demolitions expert, medic, pilot or spy. These roles offer the player a chance to perform additional tasks on top of shooting opposing players. For example, a medic player may be able to "heal" a certain number of teammates that have been hit by a paintball, returning them to the action that much faster. When a player starts the game he/she is in some games issued an identification card. Some cards also indicate the player's role in the scenario. Often, players enter scenario games purely for this role-playing aspect. Players are not required to play a role in the game, but those that accept a role may be provided with specific goals to accomplish in the game. An important aspect of role-playing scenario games is that while missions win games, role-players develop information about those missions that gain more points. This role-playing aspect extends off the field as well, and it is common for players to be "in character" both on and off the field for the duration of the game. Role-players often negotiate with other teams for props and information, and even attempt to get opposing players to defect. For role-players, the event may start before the game as they talk with other players