The Spikes (ヤドリン,Yadorin?, lit. "Yadrin"), are pink crab-type Badniks created by Doctor Robotnik, which made first appearance in the original Sonic the Hedgehog. Spikes are seen moving around while being defended by spikes on their body.
Sonic the Hedgehog (1991)
Spikes Badniks first appear in the original 16-bit version of Sonic the Hedgehog, where it can be found only at Spring Yard Zone. It will usually be on platforms by giant maces without chains. These Badniks can be a small threat, because some players will try to jump on it by its eyes. Spikes can only be defeated with a Spin Attack.
Spikes also appear in 8-bit version of the game with same name, and this time it can be found at Bridge Zone. Spikes act like they did in 16-bit counterpart and again the best way to defeat them is to roll into it.
Sonic Jump (2012)
The Spikes made a reappearance in 2012 version of Sonic Jump, where they can be found at Jungle Zone. Spikes act like they did in their first appearance, moving back and forth on platforms, but can fall from the sky to the player's neck in several sections. Spikes can be easily defeated by doing Spin Jump under of them.
Sonic the Hedgehog 4: Episode II
Following Episode I, Dr. Eggman took a new approach and remodelled his robots. One of these is a new version of Spikes, which is now developed for arctic exploration and thus has a revamped programming. This incarnation of Spikes also appeared in Sonic Dash, functioning closer to the first Spikes.
Sonic Lost World
Spikes made another appearance in Sonic Lost World, where they are enemies of Tropical Coast Zone 4. During the game, it turns out that Badniks, including Spikes, got hijacked by the Deadly Six. Only two Spikes are seen in the Zone, which are moving on ceilings. If the player runs below them, they will fire their spikes from their shells, which can hurt the player.
Spikes resembles a hermit crab with two claws that help it crawl along the ground. Spikes has pink shell which has five spikes on it. It's mouth part is colored yellow which has two eyes balls which are connected to the body via cables. It has grey wheels, which make these Badniks able to move.
The Badnik is similar to Moto Bug when it comes to its pattern. The only difference is that Spikes has a shell covered with spikes. The spikes can injure Sonic if he attacks it from above. In Sonic Lost World, they are seen able to launch their spikes from shells.
The toy company TOMY has released a Spikes action figurine during the release of Sonic & Knuckles. The series includes 21 Sonic figurines and these figurines came in packs of four under the Sonic & Knuckles label. They were also released individually under a Sonic the Hedgehog label.
Spikes' Japanese name, Yadrin, is derived from the Japanese word for hermit crab, Yadokari.
Many magazine screenshots of pre-release version shows Spikes being an enemy in the Marble Zone. Using the Debug Mode in the final version reveals that Spikes would originally appear in Marble Zone.