Various forms of the game, not all word-based, are already in the archive:
$ apt-cache search mastermind 4digits - guess-the-number game, aka Bulls and Cows ace-of-penguins - penguin-themed solitaire games
colorcode - advanced clone of the MasterMind code-breaking game gnome-mastermind - Mastermind (TM) clone for GNOME Desktop gtkboard - many board games in one program sgt-puzzles - Simon Tatham's Portable Puzzle Collection - 1-player puzzle games
Of course that doesn't preclude the addition of another.