nuclear winter, I downloaded the engine yesterday, and it gives a fast start.
I am interested in such a thing, because I make workshops about game making with kids. I'm looking for a completely freeware solution, because I don't want to force the kids to buy anything, in case that they want to proceed game making after workshop.
Are there more options than making a race game, or walking or flying around?

Here is a Very Basic Game Editor solution that I scripted for the kids:

http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=282220#Post282220

The advance against the yet free RAD3D is that I can extend - and the kids if they get familiar with Lite-C - the set of functions easily.

I couldn't find anything where I actually can write my own scripts in RAD3D.

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