Improving Yedda: http://yedda.com/questions/Improving_Yedda_1869149124114
"Play" seems to be a more appropriate term than games, I edited my question now. What I have in mind is that children have a natural (instinctive maybe?) inclination to play and create models of the world around them in their games (be it the physical world or the world of social relations, etc).
