A pickle

 is the thirty-fourth level of Even More Bloons.

Completion
To complete the level, pop the lower row of the Helium Bloons, pop the middle row of them, and then pop all the Spiky Bloons. Surprisingly, the spikes can pop both the top row jars and the bloons in a single fall, and this could be that the spikes travel at a slower speed at first row thus making the spikes have more time to contact the first row helium bloons.

Trivia

 * It doesn't have the fully correct shape of a normal pickle, even if it isn't in the bloons form.