Hey, no problem, and welcome, Emral,
Making sprites appear from the side of the screen is a simple process. Drag the sprite as far as you can into the edge, then note the "X" and "Y" positions. Then, go to the "Motion" tab and find the "Go to X:_ Y:_" and simply change the X in the correct direction so as to move the sprite far to the edge of the screen. Then, write your script from there.
Hope that helped!
Cheers,
3DBlenderRender
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You can use the "show/hide" blocks.
Like:
if abs (x position) > 200
hide
else
show
This way it disappears at the edge and reappears when it comes back into view.
Abs is found in the operators section of blocks, it just makes the number always positive.
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