Blender Game System

Does anyone know of the a website that tells how to use the blender game system? Thanks.

I don’t know that there is any one site that explains the ins and outs of the game engine. documentation would be a good place to start though. Also, there is an entire forum here at ElySiun dedicated to the Game Engine.

There is a book about the game engine.
Blender Game Kit, sold out in the e-shop, almost sold out.