Scribblenauts is pretty amazing for the kids. Seems to have an infinite library of objects you can create and use in the game to complete each challenge. A process called spawning. What's amazing is that you choose from multiple choice, you just type in the words and it creates the object. My daughter spawned an edible cage and then decided to spawn a starving man. When the starving man appeared, he ate the cage! Creative geniuses whoever made that game.