Game engine.
People who have played the game for a long time should have heard of it. Even if they haven't heard of it, they should have seen the relevant icons when starting the game.
Like a U-shaped icon, an ice palm, a geometric square and a line of Unity.
These are the famous engines of the earth.
Some of them are commercial engines, and some are specially customized engines that are not authorized by manufacturers. For example, the frost engine with the icon of "ice palm" was originally designed for the battlefield.
What is a game engine.
Actually