You take three words, and the next person has to say what word goes with it...
If the person doesn't give the right answer, then you wait, and see if someone, will have the right answer.
Then after a few tries, and no one has the answer, you let them know what the answer is, and give three more words.
Yes, there could be a few different answers, but it's the one you're thinking of that is the right answer. If a person knows for sure what the right answer is, then they can add the next three words.
These are the rules. (from Angus) and I agree.
If the word to be added always come at the beginning or the end, then it's always OK. However, if the word comes before in some and after in others, then the problem-poster has to state that it's mixed (but doesn't have to say which words are pre-pended and which words are appended).
Sample...Kick, Base, Soft
and the next person will say...Ball....
Kickball...Baseball, Softball
Sample for mixed...clothes, dance, fence
And the next person will say...Line
Clothes line, Line dance, Fence line
Then that person will give another three words
Ok, I'll start off, and you give a word that goes with all three
Coat, Airplane, Cliff