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This paper proposes a game controller with a magnifying glass-like user interface in which contents of an output screen are changed according to the movements of the controller itself. First, we begin by analyzing the portable controller's movements and discussing detection sensors. Next, we detail the output display control parameters based on the movement parameters detected as input information. Finally, we give the results of an experiment with an embedded MPU and a small sensor that demonstrates the feasibility of our proposal. The proposed user interface enabled the control and operation of a portable game device without special input devices such as a keyboard or mouse.