Well, writing in sed has essentially the "heh, look what I did in sed!" value. Elisp would be a far more simple place to build it (we already have tetris there,

Well, writing in sed has essentially the "heh, look what I did in sed!" value. Elisp would be a far more simple place to build it (we already have tetris there, there's even a very old simple version of Elite in emacs lisp!)