Try arranging books in the proper location on library shelves.
Work on either ABC order or place value with the Dewey Decimal System while practicing sorting, shelving, or reordering books.
Try all different levels to find out if you are an expert, master,
genius, or super genius.
users.ece.utexas.edu/~valmstrum/s2s/utopia/library4/src/library4.html