The Dink Network

Once I kill all the pencil head clones in pencilheads' lab why am I still in screenlock? I'm only new at playing Dink so I need all the help I can get!

I hope you've got those herb boots! You must destroy those pilars first, and then kill all the Pencilheads, but not one! Then kill the last one.

Thanks.I'll give it a go.