Spikes

From Sonic - Wiki on Neoseeker

In the Sonic series, spikes are lethal weapons that hurt the player in the game if landed on with out protection from temporary invincibility, or a shield. The spikes wouldn't kill Sonic unless he had no rings before landing on the spikes. Like a few other Sonic landmarks, they changed a lot from their initial design in Sonic The Hedgehog. A bug in the first Sonic gave Sonic no immunity when he hit spikes and bounced back onto another set; meaning he would die almost immediately.

It is worth noting in Sonic The Hedgehog 3's Marble Garden Zone that there is a badnik who looks like a set of spikes, but actually acts as a spring. It rises slightly out of the ground to shoot lasers when Sonic approaches it. You can destroy it by spindashing into it.

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