PopRox Entertainment’s social game might let you pay off your mortgage

Mike Gramling, the chief executive of PopRox Entertainment, knows what it’s like to have a house “under water,” where it is worth less than the mortgage owed on it. That’s why he built his startups and his new game, Race 4 My Place, which debuts today. The effort allows you to compete with others to create a simulated city and win prizes, including $200,000 that a winner can use to pay off a mortgage.