How to start a snake game?

thanks for the reply, but I still have some problem implementing it. Right now, I need help on cloning more and more "body blocks" as the game progresses. I only know the copyimage command. Is there a way I can use an array instead, to keep track of my blocks? or do I have to do something like this:

type tSnake
field direction
field xpos
field ypos
field imgName
end type

? Please help. Thanks :)