1. Choose a game engine or development platform: Select a game engine or development platform that best fits your game idea and skill level. Some popular choices include Unity, Unreal Engine, HTML5, and JavaScript frameworks.

2. Define the game concept: Develop a clear concept for your game including the gameplay mechanics, story, characters, and objectives.

3. Design the game: Create a visual design for your game including graphics, animations, and sounds. You can use graphic design software like Adobe Photoshop or Illustrator to create the assets.

4. Develop the game: Use the chosen game engine or development platform to start coding and developing your game. This involves programming game logic, user interfaces, and interactions.

5. Test the game: Test your game thoroughly to identify and fix any bugs or issues. Make sure the gameplay is smooth and the online features work correctly.

6. Implement online multiplayer features: If your game is multiplayer, you’ll need to implement online networking features, such as multiplayer servers, matchmaking, and player interactions.

7. Publish the game: Once your game is ready, you can publish it on online platforms such as Steam, App Store, gentong99 Google Play, or your own website.

Remember, creating an online game is a complex and time-consuming process that requires dedication, creativity, and technical skills. Good luck with your game development project!