This I heard from Alistair from Out of the Norm at one of the MathJams a couple of people wondered if you could put this online, well I believe I have done it. The rules are simple, someone puts in a valid three letter word, then the other person guesses using valid three letter words. If you guess one letter or 3 letters correct you will get the result of "odd", if you get 2 letters correct the result is even, if all the letters are correct and in the right order result is "finish".
A couple of things I haven't done, CAN'T play against the computer it is a 2 player game, also can't verify if the word is a proper three letter word apart from that it's all good