You'll need four puff balls
And three cups
Set it up with three balls showing then three cups behind it. Have one puff ball under one of the cups.
Put the cup over the puff ball.
Put the farthest puff ball on the cup that has one puff ball underneath it
Put the cup that behind that puff ball on top of the cup
Show the inside of the cup to the audience and point at the ball
Then repeat it
Cover it with the same cup that was behind the puff ball
Show the inside of the cup to the audience and point at the puff balls
The next one you show off your skills, and put two cups on top of each other
Then put the ball on top
Show the audience the inside of the cup and point to the balls
The most important rule of magic is to practice! So don't be surprised if you don't get it the first time!
The creator of this guide has not included tools