I just used it to buy Uncharted Collection for $30 after GCU. Any $60 game should be $30 after tax with GCU and this offer. It works just like a gift card in checkout. I signed up for a new visa checkout account and got the code immediately. It seems like it may only be live during NFL football broadcasts today, so act fast.
I didn't have to use a visa for payment, i used Paypal for my order.