Abstract. In this paper we introduce SYGo, an innovative hide-andseek game which is part of the AMOGA research project of the University of Bonn in cooperation with and funded by Deutsche Telekom. It is an adoption of the famous German board game Scotland Yard by Ravensburger. Besides being a location-based mobile version of Scotland Yard it comes with plenty of additional features concerning game flow, strategic planning, and sustainability. The latter is achieved since the game is designed with respect to an emerging community which again enhances the fun of playing. To cover just a few highlights SYGo includes communication features like conference calls and server-side SMS generation. Via a build-in game shop tools, services, and extra features, carrying special semantics and strategic avail, can be purchased. The main focus of this paper is presenting results from accomplished user experiences, focus group tests, and professional test sessions carried out by us, Deutsche Telekom,...