To create a Rummy game app in 2025-26, begin by identifying essential features like real-time multiplayer, secure payment gateways, and an intuitive interface. The process to develop a Rummy game involves market research, feature design, and testing to ensure a smooth gaming experience. The cost to build a Rummy game app can vary based on the complexity of the design and platform chosen. With the right planning and technology, you can create a successful and engaging Rummy game app.