UFractions (Ubiquitous fractions) is a storytelling mobile game that utilizes fraction rods in solving real life related math problems. The prototype of UFractions was tested during the period March 2009 to May 2011 in South Africa, Finland, and Mozambique amongst 279 players, ranging in age from 10 to 32, the majority being grade eight students. A multi-method approach, comprising of both qualitative and quantitative data collection strategies, was employed to develop a trans-cultural taxonomy for play motivation in mobile games, as observed in the evaluation of UFractions, i.e., altruism, challenge, cognitive restlessness, curiosity, fantasy, relations, and technology.