There is an experimental version with pseudo-3D Turtle Graphics.
In case you want to play with it locally, you can download a zip archive with all files (GPL license to be added later).
"An Enticing Environment for Programming"
Olympiads in Informatics 4:134-141 (2010).
[Slides of the accompanying presentation]
Copyright ©2009-2010, Tom Verhoeff, T.Verhoeff@TUE.NL