The Chromatic Scale is a great exercise for developing fingering strength, dexterity, and practicing the thumb under technique. Here is a 2 octave practice excercise for the right hand.
The pattern is simple: 1-3-1-3-1-2-3-1-3-1-3-1-2 (1 is your right thumb, and then count towards your pinky which is 5). If it's too fast, slow down the tempo. Once you're mastered this, take it to 3 octaves using the same pattern, and increase the speed.
Download the MIDI file below and add it to your game folder. (Make sure you are logged in and are a Gold member!)
For instructions on how to import MIDI files into Piano Wizard go here.
For a great primer see how to use The Chromatic Scale As A Map.
Let us know how you do!