As the genre developed and progressed, stealth gameplay was combined with other genres. "Sly Cooper", a cel-shaded game released in 2002, was a "stealth platformer", while 2003's "Siren" combined the survival horror genre with the stealth genre. In the same year, "Manhunt" employed a snuff movie theme and allowed the player to kill antagonists with varying levels of violence, dependent on how much time was spent sneaking behind them. It was the first to show visual executions in the genre. The following year, Konami's "Metal Gear Acid" combined the stealth gameplay of the "Metal Gear" series with turn-based strategy and tactical role-playing game elements as well as card battle elements from Konami's own "Yu-Gi-Oh!" games.