Level 8 - I went left (easy), then built two ramps, one down to the middle and then up to the right block, built a triangle and dropped a ball down it onto the red object to get it to go down the ramp to the middle block. I then erased that dropped ball after it had transferred some momentum, and timed it so when I dropped another ball down my triangle so it would hit the red object as it was oscillating back up and to the right. That gave it enough momentum to get all the way up, and then it was trivial to go to the bottom middle.
Hopefully that makes sense...
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