I found it!!!

Which spike? the bottom at the top right part where the two brown spikes are or the bottom in the left bottom part where the brown is by the part red ones? you can only push them in two directions and the one direction pops you. I am having a hard time finding it. Will you help me please?

I still can't find it? How can you push the bottom spike the other direction without busting it!?
And exactly which bottom spike?