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Many people use smartphone these days. There are many studies on the effects of smartphones on our bodies, but there is a lack of research on balance and dizziness. The purpose of this study was to determine how a healthy person’s balance and dizziness is affected by using smart devices. Twenty four healthy adults in their twenties were assigned to the 10-minute and 20-minute group based on the duration of the smartphone game. To evaluate the effects of smartphone games on the balance and dizziness of the participants, we evaluated their balance and dizziness before and after playing the smartphone game. Balance was measured using a force plate (Wii Balance Board, Balancia version 2.0, Mintosys Inc., Seoul, KR) and dizziness was measured using the Simulator sickness Questionnaire (SSQ). There was a significant difference in balance among both groups before and after playing the smartphone game (p < .05); however, there was no significant difference between the two groups (p > .05). Regarding dizziness, the SSQ score indicated minimal symptoms in the 10-minute group, while it revealed significant symptoms in the 20-minute group. In this study, playing a smartphone game for 10 minutes and 20 minutes was found to affect balance. Further, it was found that playing a smartphone game for 20 minutes may lead to a significant level of dizziness.