To create a Rummy game in 2025-26, begin by identifying essential features like multiplayer functionality, smooth user interface, and secure payment gateways. A step-by-step guide to develop a Rummy game includes market research, feature planning, design, and testing. The cost to build a Rummy game app can vary based on the complexity, design, and platform. With the right planning and technology, you can create an engaging and successful Rummy game app.