Try this simple script. If you want something more complicated, I'd be happy to give it to you.
when Green Flag Clicked
forever
if <key [up arrow] pressed?>
repeat (10) times
change y by 1
repeat (10) times
change y by -1
If you want to adjust the speed of the jump and fall, just change the value in the "repeat" block. If you want to change the height of the jump and fall, just adjust the "change y" block.
I hope that helped! If you want more, just ask.
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