Spike (obstacle)
From the Super Mario Wiki
Always a danger.
Spikes are pointy objects that usually cause instant death. These traps appeared in nearly all Mario games, from spin-offs to regular. In Super Mario World 2: Yoshi's Island and Yoshi's Island DS, spikes are found mostly in castles. A more common rough object, a thorn, also appears in the two Yoshi's Island games. In Yoshi's Story, spikes actually move and jump around in the Bone Dragon Pit and Magma Castle.
There is a Spike Stomp Badge in Paper Mario that lets Mario jump on spiky enemies such as Spinies.
