Which version of Unreal Engine does Rocket League use?

Rocket League uses Unreal Engine 3.

Psyonix built Rocket League on Epic Games’ Unreal Engine 3, the technology behind the game’s rendering, networking framework, and broader development environment. Its physics simulation also uses the Bullet physics engine within Unreal Engine 3’s PhysX system, allowing the cars and other actors to move consistently during fast matches.

The engine choice supported the game’s demanding combination of vehicle control, ball movement, arenas, and online play. Psyonix also developed dedicated-server infrastructure and custom service protocols to connect the game with Sony’s and Valve’s online services, helping make cross-platform play possible between PlayStation 4 and Windows.

Players sometimes assume Rocket League uses Unreal Engine 4 or Unreal Engine 5 because those later versions became widely associated with modern games. Rocket League’s original technology, however, remained Unreal Engine 3. The game’s polished presentation and continuing updates do not change the engine version used for its foundation.