If On Edge, Bounce
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 PrerequisiteDescription“If on edge, bounce” is a stack block in the motion category. This block is used to bounce back a sprite from the edges of the stage. 
 How does this block work?When a sprite is touching any edge of the stage, then the “If on edge, bounce” block willturn the sprite away from the edge. It will look like a ball bouncing off a wall. For example, if the direction of sprite before bouncing is 90, then the direction of sprite after bouncing will be -90.  
 Do Not RotateIf you do not want the sprite to turn upside-down after bouncing from the edge, then you can set the rotation style of the sprite to “Do not rotate”. Click on the direction input box in the sprite pane, , and select the “Do not rotate” mode: 
 