Make all blocks effected by one

I want to create a block where when any one of them is clicked, all of them disappear. So, far, I have a clicked event:
 

    public void onBlockClicked(World worldIn, BlockPos pos, EntityPlayer playerIn)
    {
    		delete=1;
    }

But then I'm stuck - how can I make all the other blocks immediately execute some code when delete is 1? There isn't exactly a "when variable is changed" event. A solution without TileEntities would be preferred, though one using them is also perfectly fine.