the first few levels are pretty easy -and you'll have no problem at all getting the ball in the cup- the game gradually gets more difficult, until you're racking your brain trying to figure out how to beat the level! The more advanced levels also have diamonds and other items you can collect to earn even more points.
Although Be a Pong has pretty simple gameplay, it's super addictive, and even has new cups you can unlock as you play and beat levels. Try Be a Pong and have loads of fun tossing ping pong balls into plastic cups.