2306, been stuck there for a very long time though, have pretty much given up on it, it is extremely hard.
Anyone who's managed to pass it must be a damn genius or something lol.
Can't remember how long I've been playing it but I don't think it's much more than maybe 3 or 4 years or so. I don't really play it much anymore, can only fail that level so many times before it just gets kinda old :p