No single "top three" applies to all children—preferences vary by age, region, and platform. However, three titles consistently dominate across demographics:
The ultimate creative sandbox. Kids build, explore, survive, and collaborate in infinite procedurally generated worlds. Educational editions are used in schools. Available on every platform.
A platform hosting millions of user-created experiences—from obbies and roleplay to simulators and horror. Highly social, free-to-play (with microtransactions), and teaches basic coding via Roblox Studio.
The battle royale phenomenon. Combines shooting, building, and frequent live events/crossovers. Creative mode allows map-making. Free-to-play; rated T for Teen (violence).