The GameStore implements a simplified purchase system. Buying one game at a time with a credit card is pretty simple. However we realize that buying one thing at a time using PayPal can be tedious.
To help make it easier to buy multiple products in one transaction, you may use the "Continue Shopping" button found in the lower left of the checkout screen (or click any store navigation action at the top of the website). The product(s) you have in the purchase order will remain as you browse for other products.
To add another product to the purchase order, click any green "Buy" button on a product. It will be added along with the prior product(s) you had chosen.
If you wish to remove an item from the purchase order, click the little trash can icon 
If you wish to return to the purchase order without adding another product, use the "Cart (#)" button found in the upper right corner of the website header. If you do not see that button, it means nothing else is in your cart. This can happen if you wander away for a half hour or more.