Dr. Casey's Alphanumeric Conundrum iPhone App
In Dr. Casey's* Alphanumeric Conundrum, the digits in a simple addition problem have been 'coded' and replaced with letters. It is your job to figure out what digits the letters really are. This is generally a process of elimination, applying a bit of logic to the individual columns within the addition problem to restrict the range of possible values a letter can have until you figure them all out.
This tutorial will show you the process. Your actual screen may look different, but the logic is the same.
The digits on the very top row are 'carry' digits, and must be 0 or 1. You can use the Not Equal (><) option to eliminate the values 2 through 9 for A and I, but take a look at the third column from the left.
A + A + G = A + (10*A)

It is not possible for A to be 0 and this equation be true, so A must be 1 and I must be 0.
A = 1
I = 0
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* Dr. Casey lived at the turn of the century. He made his living selling patent medicines to teetotalers and kept all his sales records in a secret cryptic code only he understood. He was jailed when it turned out his 'medicine' contained among other toxic items equal amounts of vanilla extract, dog tranquilizer, and raw opium. It was also discovered that his 'coded language' was nothing more than delirious incoherent scriblings created as he tried to stab the snakes he saw in his books with his quill pen.

About the programmer
Kevin Neelands lives in Gainesville, Florida (home of the fightin' gators) and gets his kicks writing silly little programs.