I've been playing SuperTux 0.4.0 and completed Icy Island. I can't figure out how to get to the bonus level though. I can't remember for sure, but I thought there used to be a dead-end branch on the road that would get you there (a while back when I was using an SVN version). Is the bonus level not accessible in the 0.4.0 release? Or is there another way to get to the bonus level that I'm missing?