Basically if you trade in tickets for example let’s say the game you can’t use is a non prime game or whatever it is called and the game you want is prime you have to pay the difference or if reverse you get a credit. I am bad when it comes to technology and it was a while ago but if I remember correctly when trading a few games in and then selecting the few Sundays we had the option to add a 3rd ticket and I think we had to pay a little extra as well.