Dora's 3-D Backpack Adventure is a 2002 Nick Jr. game that runs on 3D Groove SX. It was previously thought to be lost.
You control Dora the Exprlorer going to pick up the books that Swiper the Fox stole to take them back to the library. You walk around her neighborhood to find the books. There are these optional postcards you can pick up at Dora's House, Tico's Tree, Benny's Barn, and Boots' Tree House. There are three difficulty setting that the higher difficulties will give you more books to find.