A Computational Thinking Challenge - Developing a Programming Mentality a Graphical Way

Check out the site https://blockly-demo.appspot.com/static/apps/maze/index.html?lang=en.  There is a set of 10 challenges, where you have to set up a set of instructions (i.e. an algorithm), to accomplish the task.  You effectively are writing a program to solve the task, without actually using a programming language.  It is graphics based, instead, but it helps develop a programming mentality and begins teaching how a real program is structured and setup.  Enjoy!  And let me know if you figure out the last challenge in articular - it is tough, and I have not yet figured out the correct algorithm!  :-)