Games and devices for playing games based on market simulations are described. The games may use real market data or may simulate markets using real data. Other games may use guesses from a large number of other players to simulate the market. One embodiment is described where real estate markets are the basis for a game. The value of the real estate may be determined by actual sales prices or valuations, by automated valuation models of the sales or valuation of similar items, or from a “wisdom of the crowd” algorithm. In one embodiment, the wisdom of the crowd algorithm uses a segmented authority model to make the pricing algorithm more robust.