From Test-Scratch-Wiki

Trails on sprites create a type of fireworks effect. Here is a photo
Sprite trail effect.PNG
Listed below are two ways to make a sprite have a trail

Clone Method

when green flag clicked
forever
  create clone of [myself v]
end

when I start as a clone
repeat (5)//replace this with an estimate of how long you want your trail
  change [ghost v] effect by (20)//100/the above number
end
delete this clone

Pen Method

Create a big square the color of the background and put the following code in it:

when green flag clicked
go back (1) layers
set size to (150)
go to x: (0) y: (0)
forever
set [ghost v] effect to (20)
stamp
end

and the following code in the sprite to have a trail:

when green flag clicked
forever
  stamp
end
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