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In this paper, we propose a haptic feedback mouse that is actuated by an electromagnet. The haptic mouse works like a normal optical mouse but attraction force is generated between the electromagnet and a ferromagnetic mouse pad. We introduce some examples using the haptic mouse. For example, when the mouse cursor moves into the click able area, magnetic attraction generates strong friction, allowing the user to find the target easily. In another example, the system gives the user tactile feedback when the mouse cursor passes lines. This would be helpful to increase working efficiency for CAD work and could graphic designers who must perform abundant mouse control to select lines. If this system is integrated into computer games, it can provide the game user with various tactile experiences.