Rock Ridge Games today announced that Solution Zero for iPhone and iPod Touch is now available in the iTunes App Store, priced $1.99. The object of the game is simple: complete on-screen equations by dragging operators (+, -, x, ÷) between a set of six numbers until the solution equals zero. The total will update as players slide operators around the touch screen, offering a clear picture of their progress. In each round players must tackle ten equations, and will earn points based on number of "zero solutions" achieved, as well as how quickly the equations are solved. Players can also track their high scores and watch as their arithmetic intellect improves.