' (2009) opens with Batman driving Joker from Gotham City to Arkham Asylum. Joker also threatens to detonate bombs across Gotham. In ' (2011), the slums of Old Gotham City (the northern island) were converted into Arkham City. Inside the prison walls, this part of Gotham contains various landmarks throughout the story, like Penguin's Iceberg Lounge, the Ace Chemical Plant, the Sionis Steel Mill, the Old Gotham City Police Department building, and the Monarch Theatre with the Wayne murder scene in Crime Alley. Most of these locations have major events in the story. In ' (2013), an earlier, younger version of the city can be seen than that of other games in the "Batman: Arkham" series. In addition to the northern island, this installment in the series lets players explore a new southern island, connected to the former by the Pioneer's Bridge. The setting of ' (2015), Central Gotham City, is five times larger than Old Gotham.