Storefronts last tested between 2022-09-06 and 2022-12-23. Math Games: 1st-4th Grade Kids was tested in 5 Apple App Store storefronts — available in 4; unavailable in 1 (China mainland).Roughly 1.4 billion people live in the 1 storefront where it is unavailable. App unavailability does not by itself prove censorship.