taken from another forum:

Change 1-Letter Word Game

The object is to change one
letter ONLY, and make a new word.
You can drop a letter or add a
letter, but only change one thing.
You have to keep it going until
no one can make another word.
You CANNOT play off of your
own word. NO PROPER NOUNS AND
NO ACRONYMS ALLOWED! Each word
played must be able to be verified in DICTIONARY.com not reall for DS).

When no one can make another word.
That's the end of the game. The last successful person is the winner.

Example:
player 1-dark
player 2-dart
player 3-tart

Also, you can't repeat a word that was previously used. Ex: word words word wouldn't work.

First word:

cold

cause the temps are dropping