I was able to get the leaplet codes which come 2 to a pack for a lower than retail price when I got them on sale. I thought the sale price was more reasonable considering the games aren't as invloved as the cartridge versions. I was able to purchase the leaplet codes directly from leapfrog.com and the codes were then emailed to me minutes later. Once you have dowloaded all of your software for your Leapster explorer, you will be able to access the leaplet store and enter the leaplet code in order to redeem. There are quite a few programs to choose from although I'm anxious to see more from leapfrog. If you have the Mr. Pencil game I would highly recommend the leaplet expansion for the game for seamless play. If not, your child will get a message something like "this feature is available for download from the leaplet store" Annoying? Yes, but it does complete the game. Other leaplets are videos, storybooks, and other small games. They are a nice supplement, and I hope to see more variety soon.