https://wccftech.com/todays-list-of-paid-games-that-are-free-or-on-sale-at-the-play-store-including-galaxy-defense-and-more/

Educational, non-addictive and ad-free game for kids from 3 to 5 years old.

Charlie’s Planet is a colorful and cheerful game that contains puzzles of various difficulty and gameplay. The game is designed to educate kids on the life of animals in their natural habitat. We have carefully chosen animals of various appearance and behavior—while playing a kid learns how to compare them, thus learns to categorize, sort and organize. Such skills will be really helpful further in life.