The best part of this curriculum is the way the activities are designed. Rather than just click right answers, children are often asked to build answers, perhaps estimating how many sheep will fit in a pen (calculating area) or dragging and dropping markers onto a base-ten grid to match a quantity. Wrong answers are presented with more concrete representations of the answer, in the form of a number line or set of objects, for example. As they work through an exercise, children can see how many problems remain. In one game, each problem causes a dinosaur's neck to stretch. So children naturally want to see what happens when it reaches all the way across the screen. Finally we liked how it is possible to skip over the instructions, or replay them if needed. The choice is yours. Completing games earns coins, which can be used at a carnival arcade, with games like skeet ball where you can add up your points. Weaknesses include a clunky drawing activity, and some gender confusion in the record keeping system, which assumes that every child is a "he." All in all, this is a welcome addition to the world of technology based math curriculum, for parents and schools alike.