How to make side scroller 3d steam multiplayer using blueprints

  1. Setup UE4 project which fit best to your idea

  2. Make sure you setted up replication of all server side stuff(movement, actor and projectile spawn on server side etc). You can test everything checking dedicated server and launching 2 players or more(Imgur: The magic of the Internet )

3)Use Advanced session plugin Advanced Sessions Plugin - Community Content, Tools and Tutorials - Unreal Engine Forums

  1. Watch tutorial series which cover probably everything and even more https://www.youtube.com/playlist?list=PL3TrrCsmmxllnBvhucQ4c683a2VltXBx6

  2. Add anything you need from tutorials to your project

  3. Debug everything including replication and dedicated server data in blueprints.

  4. When building project and giving some friend for testing make sure both of you choose same steam download server!!!

  5. If you understand what you doing and how everything working(Replication easy if you understand how it works) you will find and fix everything and finish you project =D