The computer mouse has been used for more than 40 years; users, however, can only perform simple actions. To solve this problem, we present “Sinkpad”, an augmented mouse pad that has a malleable surface consisted of an elastic material. Sinkpad augments mouse functionality by allowing the user to sink the mouse into the pad and tilt the mouse on the pad. In addition, the pad provides the user with haptic feedback via the mouse. Moreover, the user can use Sinkpad as a conventional mouse pad because the pad serves as a flat surface unless the user sinks the mouse. Sinkpad allows the user to perform interesting techniques: sink, tilt, and sink+move. We also present three example applications to explore the possibilities of our techniques using the pad.