The example and the instructions make reference to a number bar. I'm guessing that in order to play this will be a drag-and-drop operation from the reference to a Number Bar in the directions. I can't find any Number Bar, in fact all I can see is the puzzle from a given day and the solution, but not a way to actually play. I've downloaded the prerequisites properly (I think) but I must have missed some step that will make the game interactive, or playable.
Is there a clue I can follow so that I can play? Some file I am missing perhaps?