Honestly I'm not sure. My process for buying a game would generally be: Open Play store, search for e.g. "toddler math", filter for "Paid" and then look for so

Honestly I'm not sure. My process for buying a game would generally be: Open Play store, search for e.g. "toddler math", filter for "Paid" and then look for something with good reviews. Even with that criteria you are likely competing with 100's of other apps.