User blog comment:BoygeyMario/Make your own Elements/@comment-20907137-20131007163149

Bubblegum:

At the beginning, this blocker covers one space.But each time a candy in its vicinity is destroyed,its size grows from 1 square of 1 space (1 X 1) to a square of 4 spaces (2 X 2) and afterwards a square of 9 spaces (3 X 3).And so on.

I have forgotten to mention that this blocker can only be destroyed by cakes or tornadoes and candies inside the bubblegum can't be swapped.