Answer:
3 point goal
I am free the first time and second time but the third time is going to cost you money.
I am always around you but often forgotten. I am pure and clean most of the time, but occasionally rotten. What am I?
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
score in end zones.
What sphinxes employ and players enjoy.