One strategy for Amazing Alex The Backyard level 2-30, called “Off the Shelf”, is to place an inverted elbow above the boxing glove so the tennis ball reaches the star there. Put the scale just under the 8-ball to it will roll off to the right. Angle two shelves back to the left and an elbow pointed down to direct the 8-ball into the basket.
If you have a different strategy for completing this level feel free to leave a comment below.