Paper Cowboys is now on GitHub in three flavors; each one utilizing a different network engine. Paper Cowboys is a simple side scroller that supports up to eight simultaneous players in co-op mode. You can get it by following this link:
Github.com
The three flavors are:
- Unity native networking
- Photon
- uLink
Which one should you use? Well, I find that Photon works the best out of the box because of its room management system letting players find and join your game without you having to open firewall ports and such. However, you should not decide before reading this excellent blog:
I don't believe I'm yet experienced enough to help you decide. Once I've actually had hundreds of players play all at once, then I'll know better.
Good luck!