A power-up reference circuit and related method that generates a reference voltage in response to the circuit being powered up. The primer is added to a hot aggregate with a surface temperature of at least 250 deg. This thickness helps the fragile wafer survive further transport and process steps. Moreover, the locking ring is mounted \u201cfloating\u201d in its receiving groove, and the channel of the screw head is connected to said annular protuberance via a truncated part allowing the screw to be undone. A second path extends away from the free end part with distance from the end surface and is connected to a deepest portion of the cam groove. Uncovering the directional symbol entitles the player to uncover one or more authorized award areas within a topological area.