In this debut offering from Carsten Studios, there are three stacks of numbers on the screen. At the bottom of each stack is a total (a target sum as those well-schooled in numbers say); an assortment of numbers sit on top of the three stacks. The goal is to drag the numbers from one stack to another so each stack adds up to its target sum. Start by choosing one of the nine ways to have the numbers displayed: dice, fingers on a hand, a honeycomb, numbers, coins, English words, Spanish words, Roman numerals, or a surprise display. Select the solve or race mode and choose to play at the "easy" or "hard" level.

The artwork is charming, the interface is entertaining and navigating the stacks is straightforward. A very satisfying musical reward signals that all adds up correctly. Deceptively simple, this aptly named game holds contagious appeal for many age groups.