After pressing the "P" key everything turns black

Hi!
I follow a simple tutorial of a maze and a ball that you can move around the maze. The problem is that when I start the game (pressing the “P” key) everything turns black and white!

What is wrong?

Oscar

You need to paint each object. Check out the tutorials section, I believe there’s some good loot there!

Yeap, that was the problem!..

how? please help
I have a walkthrough using blender.com’s walkthrough template.
My building is in there the minute I hit alt-z everything turns black and white and you can’t see anything but otherwize it works fine :-?

[You need to paint each object. Check out the tutorials section, I believe there’s some good loot there!][/quote]