I am going back in time here in the early 1990s
This was before the internet was really big. I use to use this company to exchange my genesis and snes games for other games.

I believe I originally found them advertized in a magazine like EGM. You could call them and request an updated list.

They mailed it out and the list of Genesis /Super Nintendo games were ranked in sections

A titles
B titles
C titles

You would find your game on the list. Lets say it was an A title. You can then select and exchange your A Title for any other game in the A title.

You would fill out your info form on the sheet and mail your game and a check for the exchange fee (maybe 10.00 an exchange).

About 2 weeks later your game would be in your mail box.

I remember I used them several times and never had a problem.

Does this sound familar to anyone?