Naught-n-crosses is a project mainly written in Vim Script, it's free.
Dumb Naught and crosses games
This is a mirror of http://www.vim.org/scripts/script.php?script_id=235
Naught and Crosses game inside VIM against the (dumb) computer. If you like games, see also the Tetris vimscript#172 and the Sokoban vimscript#211