One strategy for Amazing Alex The Backyard level 2-23, called “Pop Goes the Balloon”, is to angle the pipe downward to direct the 8-ball into the books. The 8-ball will roll left after pushing the books off the edge, so position the elbow to direct the 8-ball into the star on the left. Place the scissors at the bottom of the rope and the books should cause them to close. Angle a shelf to direct the balloon through the last star and into the scissors.
If you have a different strategy for completing this level feel free to leave a comment below.