http://wiki.blender.org/index.php/Game_Engine
http://www.blender.org/documentation/pydoc_gameengine/PyDoc-Gameengine-2.34/GameLogic-module.html
http://theboomshelter.com/hss.html
http://www.blender.org/development/release-logs/blender-233/game-engine-with-225-physics/
http://www.blender.org/development/release-logs/blender-234/game-blender/
http://www.blender.org/development/release-logs/blender-235a/game-engine/
http://www.blender.org/development/release-logs/blender-236/#c2113
http://www.blender.org/development/release-logs/blender-237a/gameblender/
http://wiki.blender.org/index.php/Release_Notes/GameEngine
http://wiki.blender.org/index.php/Release_Notes/Notes241
http://wiki.blender.org/index.php/Release_Notes/Notes242/Game_Engine
http://wiki.blender.org/index.php/Release_Notes/Notes243
http://www.blender.org/development/release-logs/blender-245/complete-list-of-bugfixes/