That's not too unusual for IOCCC entries. Of the top of my head, there's a flight simulator shaped like an airplane, and an addition routine shaped like a full-

That's not too unusual for IOCCC entries. Of the top of my head, there's a flight simulator shaped like an airplane, and an addition routine shaped like a full-adder. A more subtle touch is that the #defines spell out NOUGHTs AnD CRoSSES.