Spike

Spikes, in the Metroid series, are elongated pointed objects of metal that cause a good amount of damage. These first appeared in Metroid II: Return of Samus, and made an appearance later in Super Metroid. Spikes can be found on ceilings, walls, and even on the ground, sometimes forcing Samus to use the Grapple Beam to traverse to the other side. Not all spikes are harmful, however. Some are Pit Blocks that appear to be spikes, while others are deactivated and thus cause no harm. There are some spikes that can be broken if a Torizo is activated, thus revealing a hidden passage.