Some questions:
- why do you set the skycolor, when you create a skycube anyway?
- why do you use game_save, when the level is just loaded?
- What happens, when you don't set a skycolor, and don't create a skycube?

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt