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I tried to make a simple level with Pygame, which changes the background, when the player moves to a specific position (a simple level/scene change).

At startup, my first background is drawn correctly. When I change the background (move to the top left corner), the second background gets drawn correctly. But when I move to specific positions on my screen, behind the transparent sprite (set transparent with set_keycolor) not my second (correct) background is drawn, but the initial first one.

Do I heave to explicitly clear the background from the screen object? Do I have to delete the screen object, and create a complete new one?

program.py