Learn how to optimize your game for cross-platform gaming across multiple devices and platforms. Choose the right cross-platform game development framework, consider compatibility with targeted platforms, evaluate performance and features, and assess community support and resources. Design user interfaces for different devices, customize controls and input methods, and handle different screen sizes and aspect ratios. Implement cross-platform game logic using common programming languages, utilize shared game assets and code, and handle platform-specific functionality. Ensure cross-platform compatibility and stability by testing on targeted devices, handling device-specific limitations, and optimizing resource usage and performance. Design for different input methods such as keyboard and mouse, touch and gesture controls, and controller and gamepad support. Manage cross-platform multiplayer functionality by implementing online matchmaking and lobbies, syncing game state and data, and handling platform-specific networking APIs. Finally, optimize your game for cross-platform monetization and in-app purchases by implementing common payment gateways, adapting in-app purchase flows, and managing platform-specific monetization APIs.