Roblox
Price: Free to play
Roblox is one of the most popular games in the world right now. It’s a sandbox game with a metric ton of content to play through. The game is ancient by mobile gaming standards, but the ever increasing amount of things to do keeps it relevant to this day. Players can play stuff that other players create or create stuff themselves. The mobile app has complete cross-platform support with the other versions of the game and includes a chat function. The downloadable content is occasionally NSFW, so make sure to monitor your kids if you let them play. Here are some other great sandbox games as well.