The paper describes an artistic project which produced some valuable findings in relation to olfactory interactive design. It records a process of discovery in a largely unfamiliar area of interaction. The paper describes how the many difficulties which people have in discriminating, recalling and identifying smells were used as the substance of engaging gameplay. Both theoretical and practical issues are discussed, including the role of olfaction in creating a sense of complete realism, and its use to create affect and to promote engagement. Issues of specifying and controlling odour are discussed, as are problems arising from the nature of olfactory perception. A digital olfactory game is described and evaluated. The paper may seem to undermine the whole idea of using the olfactory channel, and leaves it an open question how useful olfaction may eventually prove. It is admitted that significant problems await the design of olfactory experiences.
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