Nice puzzle game. Graphics were a little basic but fit with the chalk board motif. Played through all the levels and really liked that you made so many and had those challenge levels at the end that incorporated all the elements. Oh and the introductory/explanations were excellent and really gave it that polished feel.
One critique is that the wildcard seemed to be more relevant then the theme. Maybe it is because you kept saying teaching instead of training - probably I am just be nitpicky here - really liked it so thank you for submitting.