Are you able to turn any game multiplayer, even games from online courses, like rpg games if for example i wanted to add dungeons and make them multiplayer, being able to see other people, creating parties and so from a singleplayer game. This is just a question since I do not want to dedicate myself to something that isnt possible, thanks.
Yes, making games multiplayer is possible, I’m currently making one using Unity’s Netcode for gameobject, lobby and relay services. But knowing others doing something shouldn’t mean much to you, only you know your time and money constraints and only you can decide if it’s possible or not in your specific case.
No. Multiplayer is a sum of ways different from single player games, and is a difficult converstion if not impossible depending on the size of your game. You have to pre-plan everything when it comes to multiplayer. So if you want to do it, first make sure you don’t have a large scale game. However, it is probably better to create a few multiplayer practice projects before trying to convert your single player game to multiplayer. The practice games will allow you to understand what and how you need to do things before converting an actual project.
TLDR; no, single player to multiplayer isn’t simple, it requires a lot of pre-hand knowledge and planning.