El pelotero is a place in all big shops where parents carry kids for playing.
Kids could climb and hide on assorted safe artifacts and of course is full of "pelotas" (balls) of many size and colors.
It's claimed as another Big Argentine Invention , as Dulce de Leche, Birome , Colectivo.
Here we call that "Chuck E. Cheese".
Invented by Nolan Bushnell, creator of Pong and founder of Atari.