I saw a thread for April 2004 from Grumbel saying that he was working
on a program called FlexLay for designing levels for Pingus. The
home page for that program doesn't look like it's been updated since
then, really. I got a little fed up with the dependencies on it
and gave up for the night, but do any pingus level editors exist right
now for the new (SVN version) level format?