In 2007, "Assassin's Creed" employed a social element to the stealth game, where the player is able to hide among crowds of civilians by taking care to blend in. Stealth elements were incorporated into Crytek's open world first-person shooter "Crysis", multiplayer first-person shooter "Team Fortress 2", and first-person role-playing game "Fallout 3". In 2008, "" (PlayStation 3) introduced a battlezone element, where the stealth gameplay is incorporated into a battlefield fought between two armies, both of which can be infiltrated by Solid Snake. In 2009, "Assassin's Creed II" broadened its predecessor's elements of stealth by allowing the player to blend among any group of civilians, rather than specific ones. "Assassin's Creed II" also allowed the player to distract guards by tossing coins or by hiring thieves and courtesans, and also featured a notoriety level, which made the player more recognizable until they paid off officials or tore down wanted posters. The same year, ' and ' incorporated stealth elements in different segments of the games. The multiplayer modes of "Aliens vs. Predator" in 2010 and "Killzone 3" in 2011 also incorporated stealth elements.