Slide-a-ma-jig gives the iPhone treatment to a popular children's board-book format, with a touch-screen app that lets children create a huge variety of comical characters by mixing and matching different heads, torsos, feet, and so on.
It's not really a game in the sense that there are no rules or points to score--but that's perfect for the intended audience of young children. The interface is easy to master, accompanied by satisfying sound effects: you start with a silly character (30-odd in all, anything from a hulked-out bodybuilder to a self-repairing robot to a badger-loving fairy), and you touch and slide a horizontal slice of the image to swap the hat, head, torso, legs, or feet. You can also switch between different characters with tiny buttons at the top of the screen, or tap a tiny button on the lower left to change backgrounds (everything from the clouds to the moon to the top of a school bus). You can also shake your device for a randomized character.
There's not much more to this app (and depending on the child in question, your replay value may vary), but Slide-a-ma-jig definitely delivers on its shtick with a fun, high-quality app.