This game is all about spelling. The point is to spell the longest word as you can, while not being the person ending the word. As soon as a valid word is spelled the game ends and another begins.
Here is the sample
First, someone start a letter:
The next post adds a letter...
and the next post add yet another letter...
*Stop* now the word is done because we spelled a word!
✔ The 3rd user who ended can begin a new letter s/he wants.
[If you want to start a new letter don't forget to say New sample: New: A
You can still continue on (if you want) and it's up to the next user to figure out what letters that can be made to words.