To successfully create a Rummy game app in 2025-26, begin by planning the essential features like multiplayer modes, secure payment gateways, and an intuitive interface. A step-by-step guide to develop a Rummy game includes research, design, development, and testing. The cost to build a Rummy game app will depend on the complexity of the features and the chosen platform. With the right approach, you can create a Rummy game that offers an engaging and seamless experience for users.