This paper describes the application of location oriented mobile system in National Science Museum Tokyo. Developed system was introduced as a real world role-playing game. About 20,000 children have experienced our game. In this paper, we describe briefly about system and argue about interaction and evaluation of game-like content for museum guide application by analyzing participants' behavior. We provided two different types of content. First content is a stamp rally type game story, which rule is simple enough to understand even if user experiences our application for the first time. Second content is designed to process a brief comment about an exhibit when user comes close to it just like museum visitor's companion does.
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