The Matryoshka Dolls are a weapon introduced in Ascension and returned in Call of the Dead. It works as a special grenade, and acts as a cluster bomb. Once activated, the doll will explode, popping out another doll. This process is repeated 3 times, for a total of four explosions. The explosions are extremely powerful, killing zombies in one explosion until extremely high rounds, and can down the player in two explosions should they be unlucky enough to be in the vicinity and do not have PhD Flopper.