Crusher

Black Crushers are objects that stomp to a wall, killing Sonic instantly, even if he is carrying Rings or a Shield, or even if he is Super Sonic.

Sonic the Hedgehog 2 (16-bit)
They first appear in Metropolis Zone, where they move up and down at regular intervals.

Sonic CD
They appeared in Metallic Madness, but were smaller than in Sonic 2, and they moved slowly.

Sonic Riders: Zero Gravity
One crusher appears in MeteoTech Premises. It doesn't hurt the player, but blocks the rider's path.

Sonic the Hedgehog 4: Episode 1
They appear in Mad Gear Zone, where they act the same way they did in the Sonic the Hedgehog 2.

Adventures of Sonic the Hedgehog
One crusher appears in the episode "Lovesick Sonic", used as a backup trap for Sonic. When Sonic was knocked out by the electricity magnet, he dodged it, also saving Breezie. Scratch refers it as "The Smash Stepper".