After you have gone through the 2D tutorials and the 3D tutorials, you will probably be interested in putting 2D components into a 3D game. This category covers many of the problems that can arise when doing this, and help you solve them.
1 - 2D and 3D Combinations
This tutorial will discuss one of the biggest problems that people run into when creating a game that uses 2D and 3D at the same time. Often, the 3D drawing gets messed up and you can see parts of a 3D model through the rest of the model even though it should be hidden by it. This tutorial will show you how to get through this problem.