Here is another Blender Tutorial on adding multiple colors to one object in blender. It's a little quite, so you might have to turn up your volume. Enjoy.
This Blender tutorial teaches you how to make a Heads up display that will display your score. It will also show you how to make it so that that score increases when you collect a certain object.
A quick tutorial on Object Constraints used with the physics engine. We should really have called it "Rigid Body Joints". Which is the type of Object Constraint we are demonstrating.