Which part? If you're talking about units sold rather than games made, then sure, the most popular games are often on their own engines. But that's a differen

Which part? If you're talking about units sold rather than games made, then sure, the most popular games are often on their own engines. But that's a different measure than "games made". "Unreal Engine 4 uses the PhysX 3.3 physics engine to drive its physical simulation calculations and perform all collision calculations. " https://docs.unrealengine.com/en-us/Engine/Physics https://docs.unrealengine.com/en-us/Engine/Physics "As announced at GDC’14, Unity 5.0 features an upgrade to PhysX 3.3. Let’s give it a closer look." https://blogs.unity3d.com/2014/07/08/high-performance-physics-in-unity-5/ https://blogs.unity3d.com/2014/07/08/high-performance-physic... Most of the stats I can find say unity is 50-60%, and UE is about 10%: https://www.linkedin.com/pulse/unity-vs-unreal-engine-more-confusion-game-nisha-patel/ https://www.linkedin.com/pulse/unity-vs-unreal-engine-more-c... "He said that Unity powers more than 50 percent of mobile games and about half of all PC games." https://venturebeat.com/2017/05/25/why-unity-was-able-to-raise-400-million-at-a-2-6-billion-valuation/ https://venturebeat.com/2017/05/25/why-unity-was-able-to-rai...