I was going to say Tetris until i read further down
Tetris is good for the organisational person. Someone who likes building things...but it may be too complex at that age (no offence).
It also has great mechanics and design
You could try Star Forge?
Unfortunately, Star Forge seems difficult, even to me

. It looks like na advanced Minecraft
I do agree with other poster though. Som City, Sim Ant etc.
edit on 6-11-2012 by daaskapital because: (no reason given)