Mannahatta: The Game is a location-based game for the iPhone that maps Manhattan's historical ecosystem onto its modern day streets. Players move from block to block and gain points when they make connections between the ecological elements that used to exist in the exact same location in 1609, when Henry Hudson first set foot on the island. Working individually or as part of a team, a player must cover a wide physical territory across the city to collect points, earn badges and move to the top of the leader board.