Spike Trap
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. Spikes also appear in Yoshi Topsy-Turvy. Like most other Yoshi games, they will make Yoshi lose a life if he touches them.
Spikes also appear in the Mario vs. Donkey Kong series. In these games, the spikes cause an instant death to any Mini-Mario that touches it. It also causes an instant loss if Mario touches them in Mario vs. Donkey Kong.