There are three levels of play that range from solving one step equations to more complex equations.
Each level is timed but you add time with every correct answer. The idea is to get as many correct answers as possible.
This program is a nice way for students to practice their mental math in solving equations. I am not sure I would have labeled these problems as linear equations because there were several problems with cubes or squares mixed in with linear equations. By definition, linear has a power of one. Other than that, it is a nice program as it goes from solving one step equations to multistory equations.