【實用工具app】MaskAbacus|最夯免費app-綠色工廠好玩App

This app is almost like a simple abacus. Each masked face represents a bead in usual abacus. By tapping each mask, it moves toward upper side or lower side. If the mask below the horizontal bar goes up, 1 is added to the number of the counter display. The mask above the bar means 5. You can use this as a calculator.