I think one of the both Learning Fun games was my last missing game of the 125. In the end it was more like how much I would spend on the games. And this is 15 - 25 years ago when prices more then $100 seemed crazy.
Of course after that the variations and special stuff were more in focus. And obtaining some rare German stuff took some patience. For now I still missing a European Zaxxon variant and the box of the first Demo cart (from the stuff I really looking after).