Play Design is a research project aimed at testing the potentials of mobile gaming to improve the design knowledge of high school students and freshmen. For the project we created two urban mobile games about Italian design to be played in downtown Milan. D.Hunt is an urban mobile treasure hunt that leads the players to the discovery of the icons of Italian design. In the role of a private detective, they follow in the footsteps of the famous Zizì monkey, in the center of Milan, to the solution of the riddle. D.Learn is a role-play mobile urban games in which four teams of designers challenge to win the final prize.