Choose a game idea
Decide the game genre
Pick a mobile game engine
Install the development tools
Learn the basics of the engine
Create the game design
Build the main gameplay
Add player controls
Design the user interface
Create game assets
Add sound and music
Test the game on a mobile device
Fix bugs and improve performance
Optimize for different screen sizes
Add menus and settings
Export the game for Android or iOS
Publish the game on an app store
Update the game regularly