Crabs are game objects that run towards the Crab Shell nearest to them when a match is made next to them. They fully destroy all the layers of the obstacles in their path. Once the last Crab Shell is destroyed, the Crab is collected. Crab Shells can be destroyed before a Crab is in it. Crabs and Crab shells aren’t affected by gravity, can’t be swapped with and more won’t drop down.