People can join your local server from the internet only if you forwarded ports on your rooter.
Unfortunateny, only iv:mp 0.1 T3 is playable with more than 2 players. All other releases are very bugged and unplayable (but add more functions...)
I understand that it is frustrating, but you should have think about that before starting your work...
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Thanks for the future help.
No problem, feel free to ask some fast help if needed, but I already have a lot of things to dev, here and beyond, I can't fully study your project...