Roblox

Yes, not only is it a free download but most of core gameplay is also totally with no charge.

Roblox is a user-generated content (UGC) video game development platform and virtual community. Essentially, it doesn't make games but offers players the tools to create and upload their own creations for other game players to play through them.

The platform is rated for anyone age 10 and older. Also, as a reminder: Parents should harness the powerful parental controls that exist in settings to restrict chat permissions, put monthly spending limits on money used for games and filter content maturity levels so kids can enjoy gaming or others aspects of technology without tying down major risks.

Since all games are hosted on Roblox servers and involve real-time interactions, a stable internet connection is required.