Hmmm, intersting. I can see some patterns here, but not eough to make anything work. I'll have to do more research into this.

BTW; the secret levels, they appear to be referenced from inside the normal levels, that is, when playing say diamondus 2, there is a variable in the level that says 'load level1.002 when going to secret level.' I found this when I somehow got it to make tubelectric 1 the 'secret' level, but can't seem to find it again.