Achievement systems are reward structures providing additional goals for players, and thus extending the play time of videogames. In this paper, we explore how applications other than games could benefit from achievement systems, and how users perceive this additional content in a service. For this purpose, we added an achievement system to a geo-tagged photo sharing service called Nokia Image Space. The results suggest that there is some potential in achievement systems outside the game domain. The achievements triggered some friendly competition and comparison between users. However, many users were not convinced, expressing concerns about the achievements motivating undesirable usage patterns. Therefore, an achievement system poses certain design considerations when applied in nongame software.

In addition to functionality and usability, interactive products are increasingly expected to provide pleasurable experiences to their users. Playfulness is a part of these experiences. However, playfulness can manifest in many different ways as humans are inherently playful by nature. This poses challenges for designing for playfulness. To tackle this broad field, we have developed the Playful Experiences (PLEX) framework. The two-fold purpose of the PLEX framework is to be a conceptual tool for understanding the playful aspects of user experience (UX), and be a practical tool for designing for such experiences through established user-centered design (UCD) methods. In this paper we present an overview of our work during 2008--2010 on designing for playful experiences. After introducing and summarizing previous studies, we motivate the reasons for designing for playfulness by framing PLEX within the domains of user experience and emotional experience. Then, we briefly discuss the creation and evaluation of the PLEX Cards and its associated techniques as practical design tools based on the PLEX framework, followed by a concrete design case where these tools have been used. We also present the development of the PLEX Design Patterns for actual design solutions for playfulness. Based on this work, we propose the PLEX framework as a powerful tool for understanding playful experiences, and for providing inspiration to design interactive products that elicit playfulness

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We present a study that investigates the potential of combining, within the same interaction cycle, deformation and touch input in a handheld device. Using a flexible, input-only device connected to an external display, we compared a multitouch input technique and two hybrid deformation-plus-touch input techniques (bending and twisting the device, plus either front-or back-touch), in an image-docking task. We compared and analyzed the performance (completion time) and user experience (UX) obtained in each case, using multiple assessment metrics. We found that combining device deformation with fronttouch produced the best UX. All the interaction techniques showed the same efficiency in task completion. This was a surprising finding, since multitouch (an integral input technique) was expected to be the most efficient technique in an image docking task (an interaction in an integral perceptual space). We discuss these findings in relation to self-reported qualitative data and observed interactionprocedure metrics. We found that the interaction procedures with the hybrid techniques were more sequential but also more paced. These findings suggest that the benefits of deformation input can still be observed when deformation and touch are combined in an input device.