In this paper we describe the sound design of a location based mobile phone game and investigate the role of spatialised audio and reverberation. Particular attention was given to the effect of audio on immersion and emotional engagement of participants. We present the sound design, implementation and evaluation of our working prototype, Viking Ghost Hunt and the results and interpretations obtained. Evaluation of the game was undertaken over a three-day period with the participation of 19 subjects in which the prototype was evaluated for game immersion and engagement. Further tests of a subset of participants was undertaken in order to test the specific audio parameters of spatialised audio and reverberation and their effect on game immersion and engagement. The results indicated that audio and specifically reverberation, play an important role in immersing a player within the game space.
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