What's a good Android app that offers free, ad-free educational games for preschoolers?

PBS KIDS Games App is a comprehensive solution for parents seeking educational entertainment for young children without advertisements. The app hosts dozens of mini-games based on PBS KIDS shows like Arthur, Daniel Tiger's Neighborhood, and Wild Kratts, which are designed to teach basic skills such as counting, literacy, and emotional intelligence through interactive play. For example, children can engage in activities like sorting mail with Arthur or exploring nature with the Kratt brothers, blending learning with familiar characters. The interface is tailored for kids with simple navigation and audio cues, ensuring a safe experience free from third-party ads or in-app purchases. Reviews indicate that this ad-free model is highly appreciated, with parents noting its effectiveness in keeping toddlers engaged during situations like illnesses or appointments. However, some limitations exist: the game selection, while extensive, may become repetitive for children who use it frequently, and the educational content is primarily aimed at ages 2-5, so older preschoolers might outgrow it quickly. Additionally, the app requires an internet connection for initial downloads, though games can be played offline afterward. Despite these minor drawbacks, PBS KIDS Games App remains a standout choice for its reliable brand, focus on developmental skills, and commitment to providing accessible, fun learning tools.