Finally, after having to spend tens of minutes correcting and converting the first of the real levels from an addon (Tux Strikes Back), I got a working levelset ready to be read by the offical supertux-editor.
NEW: All of the levels have been minimally finished, with some having been altered more than others. Included are both the repacked addon and the levels themselves.
GREAT: The original author Christian Schaefers has now allowed me to license my modifed levelset as CC-BY-SA, version 4.0.
This means that commercial use of this version is now permitted; the license for the original levelset remains unchanged so that two different confusing versions won't exist.The intro level and the extro stuff will remain unaltered, except for adding my credt for this work.
NOW: The new versions of the levelset are here! I fixed up more stuff as described in replies.
