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OK, there are lots of BASIC's about, but for children DarkBasic (www.thegamecreators.com) seems pretty good; lots of very simple commands to make cubes and spheres etc. eg Make object sphere (size)!
'Johnny', aged 9, has 50 randomly placed planets with his spaceship flying around between them and a screen view that is following the ship.
Thankfully, DarkBasic is compatible with my recollections of ZX Basic but this doesnt mean that firing bullets in 3D space is going to be a simple task!
If youve got Lego Mindstorms, try NotQuiteC inside BriccX. He used this last winter and wasnt troubled by C's arcania - that's the beauty of being young.