The purpose of this study was to examine the effects of a light-version pet-nurturing game, named My-Mini-Pet, in the handheld device. Two aspects of hand-held games (stimulative and sustainable aspects) are identified, and the sustainable aspect is emphasized in this paper. The My-Mini-Pet system is designed to maximum the effect of the sustainable aspect. A preliminary experiment was conducted, and the result revealed that overall motivation, attention, and relevance of participants in the experimental group were significantly different from these of participants in the control group. Some implications about experimental results were also discussed.