Abstract: A surgical tool tracking array can include a first marker holder, a second marker holder, and a tool holder. The first marker holder is configured to couple a first marker to the surgical tracking array in a first plane. The second marker holder is configured to couple a second marker to the surgical tool tracking array in a second plane that is independent and substantially parallel to the first plane. The tool holder is configured to couple a portion of a surgical tool to the surgical tool tracking array in a third plane that is independent from the first plane and the second plane.

Abstract: A system for playing a game of chance includes a plurality of playing cards, each of the playing cards displaying game symbols thereon. At least some of the plurality of playing cards display an eligible game symbol for participation in bonus levels of play. A master game card is provided for use in conjunction with the playing cards. The master game card includes a plurality of playing areas, each playing area representing a playing level. In each playing area, one or more of the eligible game symbols are included as a bonus level game symbol for the respective level of play. In each successive level of play, more of the eligible game symbols are identified as bonus level game symbols. Cover members conceal the bonus level game symbols prior to play. By opening one of the cover members at each level in turn, a winning one of the eligible game symbols is revealed.

Abstract: A system for playing a game of chance includes a plurality of playing cards, each of the playing cards displaying game symbols thereon. At least some of the plurality of playing cards display an eligible game symbol for participation in bonus levels of play. A master game card is provided for use in conjunction with the playing cards. The master game card includes a plurality of playing areas, each playing area representing a playing level. In each playing area, one or more of the eligible game symbols are included as a bonus level game symbol for the respective level of play. In each successive level of play, more of the eligible game symbols are identified as bonus level game symbols. Cover members conceal the bonus level game symbols prior to play. By opening one of the cover members at each level in turn, a winning one of the eligible game symbols is revealed.