iBrain Test for the iPhone/iTouch is superb,if you have an iPhone, you need this app.
In section 1, you have 90 seconds and you must select the dropping animals according to the sequence they are showed.
In section 2, you have 60 seconds and you must select the heaviest fruit as quickly as possible.
In section 3, you have 60 seconds and the words color or meaning on the balloon you selected must be the same with the color of the balloon in the top.