Electronic wagering

At least one non-transitory computer readable medium that stores a plurality of instructions, which when executed by at least one processor causes the at least one processor to:

• account for a money deposit associated with a first mobile computing device having a wagering game thereon and being constructed and arranged to read an optical machine-readable code;
• generate an optical machine-readable code that includes data related to the amount of the deposit;
• associate such a first mobile computing device with a person and provide the generated code to the person;
• receive an image of the generated code via the camera;
• apply a credit to the wagering game related to the generated code;
• permit a player to play the wagering game on the first mobile computing device responsive to wagers made using the applied credit;
• display at least two images on the touch-sensitive screen as part of play of the wagering game;
• and
• reveal game outcomes in one of two ways, namely:
• (i) change one of the images to display one of a winning outcome or a losing outcome of the game responsive to the player touching the screen adjacent the one image;
• or
• (ii) change the at least two images to display one of a winning game outcome or a losing game outcome responsive to a player swiping along an axis adjacent both images;
• generate data related to a current activity level of the first mobile computing device;
• transmit the generated data to a computer system;
• receive additional data at the computer system related to the current activity level of each of a plurality of additional mobile computing devices;
• determine how long each mobile computing device is idle for longer than a predefined time;
• vary the predefined time as a function of the number of mobile computing devices;
• and
• send a message over the network to the first mobile computing device when the first mobile computing device is idle for longer than the predefined time.