PHILADELPHIA (CBS) – This one’s a little hard to describe.

Click on this game and you’ll see four pillars of falling material – sand, water, oil and salt. As each falls slowly to the bottom of your screen, you can add walls, plants and fire to alter their paths and make them interact with each other.

Why would you do this? I have no idea, but it’s addictive and it’s fun to watch. Stop by and try it yourself. And just try stopping after a few minutes.

Go to the FallingSandGame.com.

Reported By Bob Bicknell, KYW Newsradio Tech Reporter