The Rock Crusher is a hazard that appears in the snow themed-levels in Crash Bandicoot 2: Cortex Strikes Back. Primarily appearing in the cavern portions of Snow Go, Snow Biz, and Cold Hard Crash, the rock crushers act similar to the log crushers where they will try to squish the player under the weight of the devices.
Unlike the log crusher though, their appearance is not so obvious. They will initially be hidden from the player's view and will only pound on the ground upon getting close to them. This makes detecting them tricky for the player. However, one can distinguish them by the crack marks underneath the device. They will only pound down at the player when he tries to run underneath, requiring the player to time movements while around them. If squished by one of the rock crushers, the player will lose a life and go back to the nearest checkpoint. Normally, if the player runs underneath them, he/she will make it through in time. However, the rock crushers in the red gem path of Snow Biz (& all snow levels in the N.Sane Trilogy) pound down faster, requiring the player to slide (or use the Speed Shoes in the N.Sane Trilogy) when running underneath.