Abstract: Providing a request is disclosed. A first distance indication indicating a physical distance between the first mobile device and a reference location is received from a first mobile device. It is determined that the first distance indication meets a threshold criteria relative to a second distance indication of a second mobile device. A request for payment is provided to the first mobile device based at least in on part on the determination that the first distance indication meets the threshold criteria.

Abstract: A single reel game includes a single reel having a plurality of symbols that are adjacent to one another. The single reel then moves and follows a track that displays the symbols in a spatial order. The single reel is then stopped at a starting reel stop that provides a reference point for stopping the single reel. A win window displays the plurality of the single reel symbols. A payline is then overlaid on the symbols within the win window. The single reel game also includes a paytable that lists a plurality of payout prizes for each combination of symbols along the payline. A prize is awarded when the single reel game symbols along the payline match the paytable combination of symbols.

Abstract: Transmitting a sonic signal is disclosed. An ambient audio level is detected. A signal intensity is determined. The signal intensity is determined based at least in part on the detected ambient audio level. A sonic signal encoding data is transmitted to a mobile device. The sonic signal is transmitted at the determined signal intensity.