What command do you use to start an animation or game in ex?

In the context of using the game engine GDevelop, you typically start an animation or game using the "Start" event or by pressing the "Preview" button within the interface. In programming languages like Python with libraries such as Pygame, you would initialize the game loop with a command like pygame.init() followed by the main loop structure. The specific command can vary depending on the framework or engine being used. Always refer to the documentation for the specific commands relevant to the tool you are working with.