How I Use It
I use this primarily as a supplemental activity as motivation for a reluctant learner or as an extension for early finishers. It's a classic puzzle game, so its focus is specific. As a puzzle, it's not an instructional app per se, but it does do a good job at exercising visual and spacial processing.
This is an example of a narrowly focused tool that belongs among many others in your app repertoire. It's engaging for a wide span of ages. The hint option is helpful for those puzzles that have a student stumped.