Roughly half of all games today run on Unity, while Unreal Engine’s share of high-fidelity 3D immersive worlds is estimated at between 15% and 25%. Roblox’s R&D expenditures may exceed that of both Unreal and Unity, but this ignores the billions in additional investment made by licensors of these engines. The two most popular games in the world, excluding low-fidelity casual titles such as Candy Crush, are PUBG Mobile and Free Fire, both built on Unity.
