Tiny Tower is a business simulation video game developed by NimbleBit, released on June 23, 2011 and November 16, 2011 for iOS and Android devices respectively. The game tasks players with managing a tower filled with virtual people, referred to as “bitizens”, with the goal of building new floors and gradually making the tower taller, which attracts bitizens to move in and work in any floor the player designates. The game's reception has generally been positive, receiving 4.5/5 on Apple's App Store and being awarded iPhone Game of the Year by Apple in 2011. On iOS, Tiny Tower is integrated with Apple's social gaming network, Game Center. Game Center provides achievements, leaderboards (based on the number of floors players have) and challenges sent by others. It also allows the player to compare with their Game Center friends' towers. However, Android devices are integrated with the Mobage social gaming network, and unlike Apple's Game Center, an internet connection and a Mobage user name are required to play Tiny Tower on Android. On August 24, 2015, Mobage announced the shutdown of Tiny Tower along with five other Mobage games. The shutdown of the Android version of Tiny Tower was announced for September 24, 2015. On May 25, 2016, NimbleBit announced the return of Tiny Tower to the app store with some new upgrades to the app including new floors, costumes, lobbies, roofs, elevators, missions, BitBook posts, and the ability to trade bitizens with friends and earn new Golden Tickets.