You can create multiple backgrounds for the stage. They are like costumes in a sprite. You can switch background with the block of that name in the looks section.
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Click on the stage item (block next to sprite) then click the backgrounds tab. At the top it will say New Background: Paint Import. Click Paint to make a background on the spot, click Import to use a pre-made background. You can also edit the original stage.
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how do i make a sprite go to next level?
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Simply have a "switch to next background" instruction on the stage, triggered by whatever it is you want the player to do when they finish the level.
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