Online Save Games

I was wondering if there were any other ways besides SRB2 PlusC to save online game as that isn't supported anymore.

Well, 2.2 appears to be able to have that coming. So maybe.

Sadly last I know 2.2's new Lua save feature is only going to be applied to SP save files, which is undeniably going to be a million times less versatile than PlusC's I/O as it won't work in netgames at all to begin with.

We tried adding a way to save online progress back in 1.09, however it was very buggy and eventually we decided to scrap it. At the very least, you can just use level select to get back to where you were.

The "Luabanks" extra-data feature is synchronised in netgames but nothing is ever written to an external file unless playing in singleplayer. It is less versatile than SRB2IO because SRB2IO is overkill for many usecases, and if I remember correctly it won't be in 2.2 because of netplay sync issues (necessitating the way smaller feature).