Some of us wish, when we were first learning test-driving, refactoring, and deep OO, that we had had a genuine side-by-side comparison between code Heaven and code Hell. Such an object lesson would have made the value and benefits of agile programming practices so much more plain, so much sooner. Alas for us, but hurray for you! This codebase enables you to compare and work with two very different implementations of the same problem domain: one of them fabulously ugly, and the other of them — well — much closer to gorgeous.

The problem domain is a 10x10, first-to-5-in-a-row-wins tic tac toe game.