Welcome to the Pet Rescue Community
Do you need help with your game? Ask the Community for help.
Do you mean the 'electric blocks' that put mesh onto everything? They can only be destroyed when they are free of mesh, so make a match beside them (or use a booster) to get the mesh off, then use a booster (from in the game if you cannot buy any) to destroy them. You can use line blasters or bombs. Here is an example of a Level with them inhttps://www.youtube.com/watch?v=nA99wIBmA4A