This list is taken from here: 
http://wiki.linuxquestions.org/wiki/BSD_games
I've modified this list a bit to match current Debian Squeeze package installed

                              -   mewbies.com   -
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ALPHABETICALLY:
    adventure - an exploration game
    arithmetic - quiz on simple arithmetic
    atc - air traffic controller game
    backgammon - the game of backgammon
    battlestar - a tropical adventure game
    bcd - reformat input as punch cards, paper tape or morse code
    boggle - word search game
	countmail - be obnoxious about how much mail you have
    caesar - decrypt caesar cyphers
    canfield - the solitaire card game canfield
    cfscores - show scores for canfield
    cribbage - the card game cribbage
    dab — Dots and Boxes game
    go-fish - play Go Fish
    gomoku - game of 5 in a row
    hack — exploring The Dungeons of Doom
    hangman - Computer version of the game hangman
    hunt - a multi-player multi-terminal game
    huntd - hunt daemon, back-end for hunt game
    mille - play Mille Bornes
    monop - Monopoly game
    morse - reformat input as punch cards, paper tape or morse code
    number - convert Arabic numerals to English
    phantasia - an interterminal fantasy game
    pig — eformatray inputway asway Igpay Atinlay (Pig Latin)
    pom - display the phase of the moon
    ppt - reformat input as punch cards, paper tape or morse code
    primes - generate primes
    quiz - random knowledge tests
    rain - animated raindrops display
    random - random lines from a file or random numbers
    robots - fight off villainous robots
    rot13 - rot13 encrypt/decrypt
    sail - multi-user wooden ships and iron men
	sl-h - modified version of sl animation
    snake - display chase game
    snscore - show scores for snake
    teachgammon - learn to play backgammon
    tetris-bsd - the game of tetris
    trek - trekkie game
    wargames - shall we play a game?
    worm - Play the growing worm game
    worms - animate worms on a display terminal
    wtf - translates acronyms for you
    wump - hunt the wumpus in an underground cave 

BY GENRE:
Action games:
    hunt - a multi-player multi-terminal game
    huntd - hunt daemon, back-end for hunt game
    worm - Play the growing worm game 

Board games:
    backgammon - the game of backgammon
    gomoku - game of 5 in a row
    monop - Monopoly game 

Card games:
    canfield - the solitaire card game canfield
    cfscores - show scores for canfield
    cribbage - the card game cribbage
    go-fish - play Go Fish
    mille - play Mille Bornes 

Formatting fun:
    bcd - reformat input as punch cards, paper tape or morse code
    morse - reformat input as punch cards, paper tape or morse code
    number - convert Arabic numerals to English
    pig - eformatray inputway asway Igpay Atinlay (Pig Latin)
    ppt - reformat input as punch cards, paper tape or morse code
    random - random lines from a file or random numbers
    rot13 - rot13 encrypt/decrypt 

Puzzle/Quiz:
    arithmetic - quiz on simple arithmetic
    boggle - word search game
    dab — Dots and Boxes game
    hangman - Computer version of the game hangman
    robots - fight off villainous robots
    snake - display chase game
    snscore - show scores for snake
    tetris-bsd - the game of tetris
    quiz - random knowledge tests
    wump - hunt the wumpus in an underground cave 

Role playing:
    adventure - an exploration game
    hack — exploring The Dungeons of Doom
    battlestar - a tropical adventure game
    phantasia - an interterminal fantasy game 

"Screensavers":
    rain - animated raindrops display
    worms - animate worms on a display terminal 

Simulation games:
    atc - air traffic controller game
    sail - multi-user wooden ships and iron men
    trek - trekkie game 

Various calculations:
    caesar - decrypt caesar cyphers
    pom - display the phase of the moon
    primes - generate primes 

Other:
	countmail - be obnoxious about how much mail you have
	sl-h - modified version of the sl animation
    teachgammon - learn to play backgammon
    wargames - shall we play a game?
    wtf - translates acronyms for you