a bonus device and method are set forth for gaming machines . the bonus device is configured as a two dimensional display or three dimensional object , such as a sphere , box , or football shape , which can be controlled to rotate , spin or move to display a bonus . the bonus device is embedded with display technology that allows the bonus amounts , to change upon certain conditions in the base game such as an increased number of credits wagered , combinations achieved in the base game , or other random occurrences .