Four.
Yes, four.
SRB2 at this point is just kinda "blah" to me. The netcode needs work, OpenGL is glitchy, software doesn't have any special features, no slopes (argh.), and well, the replay value is pretty much gone by now. All the levels out there have essentially got the same generic feel to them, just with varying difficulties and different texture sets. It's just not anything new to me anymore, and the over-saturation of sh... er, crappy wads out there doesn't exactly help the situation out either.
Additionally, the gameplay is a little basic for my tastes. What we need now is some kind of mission mode. That'd add some much-needed pizazz.
I do appriciate the moddability of the game, though. That brings it up a notch. Too bad a ton of other Sonic fangames out there are starting to do the same thing, with built-in level editors and far superior results.
I'm starting to see why JTE moved on from SRB2 onto other games with more massive scopes. Meh.