How can I make numbers disapear to reveal a prize on powerpoint please?

[DrNortherner]

I know it can be done but my brain is dead.

Thanks

Thanks but that wont work, I need to creat like a grid of numbers and the winner clicks on their number to see what they have won.

I'm sure it can be done but how?

Thanks Lapin, I've done something similar.

There are 6 numbers and I hyperlinked each to link to a new slide (statitng the prize) on mouse click!