Here is the thing, I prefer playing the game alone, that's why I mostly review single player levels.

But I want to try reviewing battle, race, CTF, etc. levels as well. But what's the best way to do it?

Of course to properly review these I need to play the level online, and sadly that's where the problem lies. If I make a server it's very unlikely some stranger would join. And I have no friends in real life that play Jazz Jackrabbit 2 as well. So how do I review these kinds of levels?