Define the game idea
Choose the genre
Identify the target audience
Set the platform
Write the core gameplay loop
Create a game design document
Pick a game engine
Set up the development tools
Build a prototype
Develop the main mechanics
Create the game assets
Implement user interface
Add sound and music
Program game logic
Design levels or maps
Test for bugs
Balance gameplay
Optimize performance
Playtest with users
Fix issues from feedback
Prepare marketing materials
Publish the game
Update and maintain the game