From BlenderWiki

[edit] Blender Game Engine Overview

Blender has its own built in Game Engine that allows you to create interactive 3D applications. The Blender Game Engine (BGE) is a powerful high-level programming tool. Its main focus is Game Development, but can be used to create any interactive 3d software for other things, such as interactive 3d architectural tours or educational physics research.

[edit] Using the Game Engine

The core of the BGE’s structure are Logic Bricks. The goal of Logic Bricks is to offer an easy to use visual interface for designing interactive applications without any programming language knowledge. There are three types of Logic Bricks, Sensors, Controllers and Actuators. Each one is better detailed here:

• Sensors
• Controllers
• Actuators

If you prefer to write games using Python, the game engine also has its own [Python API], separate from the rest of Blender, which you can use to write scripts to control your game. This is done by creating a Python Controller and linking it to a python script.

[edit] Subpages

1. Camera
2.    Dome mode
3. Features
4. Logic
5.    Actuators
6.       2D Filters
7.       Action
8.          Common
9.       Edit Object
10.       IPO
11.       Motion
12.       Property
13.       Scene
14.       Shape Action
15.    Controllers
16.    Object type
17.       Dynamic
18.       No collision
19.       Occluder
20.       Rigid body
21.       Sensor
22.       Soft body
23.       Static
24.       actor
25.       anisotropic
26.       bounds
27.       damp
28.       do fh
29.       form
30.       ghost
31.       invisibile
32.       mass
33.       no sleeping
34.       radius
35.       rot fh
36.       rotdamp
37.    Properties
38.    Sensors
39.       Types
40. Physics
41. Python
42. Python API
43.    Bullet physics
44.    VideoTexture
45. Resources