Purpose and scope. This report examines okrummy, traditional rummy, and Aviator as popular examples of digital and analog games that blend skill, chance, and behavioral design. It synthesizes publicly observable features, market patterns, and user experience considerations to aid readers in understanding how these products operate, why they attract players, and what risks and safeguards are relevant. Overview of the three subjects. Rummy is a family of melding card games in which players form sets and runs to go out