In this website you will find very useful step-by-step Blender tutorials, mostly regarding the Blender Game Engine, plus a complete Python Game API documentation reference with code snippets and examples on every class and method.

In this tutorial we examine how to export a model from Blender to Unity 3D and import it into a game. The tutorial also demonstrates how to bake a normal map and a color map from a highpoly model to the lowpoly counterpart, real-time display of the color/normal maps in the Blender viewport with GLSL shading, and real-time updating of assets in Unity.

Use the Video Texture module to play movies in the Blender game engine.  Python code and example blend included.

Use the mouse to look up, down, left and right in the Blender Game Engine.  Options include capping, invert mouse pitch and adjust mouse sensitivity.