iPhone demo app HOMEWORK

We are looking to develop a kids Simon memory game. With the same concept of: [login to view URL] It's a Simon Says game, but instead of just 4 buttons with beep sounds each button as an animal image on it and it makes the sound of the animal. You can see classic simon versions on iTunes, for example: [login to view URL] The application must be structured in a way that its easy to replace the animals images and sounds with other types of images like fruit or cars and such, and create another different game with same infrastructure. Or by loading an array from a website.