Hello. How can i bounce the ball continuesly? And how can the ball stretch when it touch to platform? Sorry for my english 
continuously bounce-> physical material bounciness = 1, drag = 0, friction = 0
stretch → soft body… search for that, but I have never done anything with softbodies.
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Thank you friend. But i forgot to say that is 2D. There is no soft body.
There is a deformation tool on asset store. But you have to animate by hand anyway.
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Thank you friend. I am going to search it. Thank you very much.