Spikey (Super Mario Land 2: 6 Golden Coins)

A Spikey is a hedgehog-like enemy found in the game Super Mario Land 2: 6 Golden Coins. It can only be found in the Tree Zone level Invincibility!. A Spikey's attack pattern consists of blinking between two shades, curling itself up into a ball, then dashing forward in an attempt to ram Mario. Despite having spikes, Spikeys can be defeated by jumping on their heads.

Super Mario Land 2: 6 Golden Coins

 * Virtual Console Manual: "This weird creature will curl up its spiked body and roll at Mario."