This was devised by a team at MIT and they have designed it in such a way that when the designer ids putting a game together, the commands that can be used need to fit together in the way a jigsaw might. This helps contextualise and represent the text driven code world in a more accessible iconic world. I have a feeling that this might just help to lower the skills threshold for games design. The code looks something like this when you create it Something like this:
If anybody out there is using it then let me know how you are finding it. In the meantime I have joined the Scratch blog and hope to get clued up on how to use it via that establishing community.