Another graphical programming environment for kids is Snap! http://snap.berkeley.edu/ http://snap.berkeley.edu/ From the about page: One of the limitations of

Another graphical programming environment for kids is Snap! http://snap.berkeley.edu/ http://snap.berkeley.edu/ From the about page: One of the limitations of Scratch as a language for computer science education is that its lists are not first class, so you can’t have a list of lists. Making lists first class is enough of an extension to Scratch to allow the creation of any other data structures (trees, heaps, hash tables, dictionaries, and so on) in user-defined Snap! code, implemented as lists of lists. via https://snap.berkeley.edu/about.html https://snap.berkeley.edu/about.html