Snake game - delete clones

hey people! :elderly:

i want to make my own snake game, i found this tutorial: http://www.virtual-fx.net/tutorials/html/snakegame.html.

but i changed it so when you die instead of restarting you come to a new scene where it says game over. But all the clones still are there :stunned:

how do i take them away?
thanks for all your help :hr: