Oh, okay! I've been meaning to write an article about end of level events for some years now, but JJ2+ definitely swirls things around, adding some new possibilities and removing a couple. JJ2's always done a great job with its basic secret level functionality (not the bonus signpost, the other kind), it's just unfortunately always been really hard to use. (I had a system for making the regular secret level event work, actually, but I never really released it, and now it's redundant. Psh.)