A Hermit crab type robot which has been newly developed for cold regions. The spines on its hard shell will repel any attacks done by Sonic alone. There must be another way to defeat it... — Profile, Sonic The Hedgehog 4: Episode II website
The Spikes resembles a hermit crab with two claws that help it along the ground. It has a pink shell with five spikes on it, a yellow snail-like head and two large eyes on thin eyestalks. They also have a pair of gray wheels on their shells to move back and forth with. Originally, they had the basic black eyes with white sclera, but in Sonic Lost World they got cyan eyed.
In Sonic the Hedgehog 4: Episode II, the Spikes had a more modernized and technological design. In addition to a getting a more realistic gastropod shell, they received three rows of spikes on they shell. Their head also became smaller, their eyes lost their eyestalks, and they got four extra legs in exchange for their wheels. Additionally, their body became pink with a white underbelly and their shell became blue with pink outlines.
Game appearances
Sonic the Hedgehog (16-bit)
The first appearance of this Badnik was in the original 16-bit version of Sonic the Hedgehog, where it served as an enemy. This time around, this Badnik is referred to as Spikes[2] (ヤドリン[3],Yadorin?, lit. "Yadrin"[1]). In this game, the player encounters them in Spring Yard Zone.
In gameplay, the Spikes will walk back and forth, usually on platforms with iron balls. These Badniks can be a small threat, since any attacked launched on them from above will cause the player to take damage, thereby makignthe Spikes nearly invulnerable. Spikes are best defeated with a Spin Attack to the sides. Also, upon their destruction, they release an Animal and reward the player with 100 points.
Sonic the Hedgehog (8-bit)
In Sonic the Hedgehog (8-bit), the Spikes appear as enemies again. In this game, they can be encountered in Bridge Zone. in gameplay, Spikes act like their 16-bit counterparts; they walk slowly back and forth without attempting to hurt Sonic. Again, the best way to defeat them is to roll into them with the Spin Attack. While they do not release an Animal upon their destruction though, they do reward the player with 100 points.
Unlike in earlier games, the Spikes cannot be defeated with a Spin Attack or Spin Dash because spikes cover its whole shell. There are three ways to destroy it: crushing it with a snowball, rolling over it with the Rolling Combo, or go near the Spikes which will cause it to go inside its shell along with its spikes, allowing the player to destroy it. If a Spikes is destroyed by a snowball though, the player will not be awarded with any points.
Sonic Jump (2012)
In the 2012 version of Sonic Jump, Spikes can be found in Jungle Zone. Spikes behave like they did in their previous appearances, moving back and forth on platforms, but can also fall down on the player from above in several sections. They can be defeated easily by hitting them with a Spin Jump from below.
In Wii U/PC version of Sonic Lost World, Spikes appear in Tropical Coast Zone 4. During the game, it turns out that the Badniks, including the Spikes, got hijacked by the Deadly Six. Only two Spikes appear in the Zone, both of whom are moving on ceilings. If the player runs below them, they will fire their spikes from their shells which can inflict damage.
Powers and abilities
The Spikes are similar to Moto Bug when it comes to their attack pattern. The only difference is that Spikes have a shell covered with spikes. These spikes can injure the victims should they attack it from above. In Sonic Lost World, they can launch their spikes from their shells.
In the Sonic the Comic series published by Fleetway Editions, the Spikes are a part of Dr. Robotnik's Badnik army and are among the first generation of Badniks the doctor produced. Depending on the artist, the Spikes' coloration has been altered slightly each times.
Merchandise
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.
Trivia
Spikes' Japanese name, "Yadrin", is derived from the Japanese word for hermit crab, "Yadokari". Its western name was left uncertain at first, as it was not listed in the instruction manuals for neither the 16-bit nor 8-bit versions of its debut game. The earliest known source for the western name "Spikes" came from the "Robotnik's Badniks" list featured in the Stay Sonic guide book.[2] It is later used as its name in the comics and in Sonic the Hedgehog Classic Style Guide.[4]
Many magazine screenshots of pre-release version shows Spikes in the Marble Zone. Using the Debug Mode in the final version of the game reveals that Spikes would originally appear in Marble Zone but were ultimately replaced with the Caterkiller.
↑ 2.02.12.2Pattenden, Mike (4 January 1993). "Robotnik's Badniks". Stay Sonic. Fantail. p. 35. ISBN 978-0140903904. "Less of a hermit crab and more of a harm-it crab, Spikes is a weird blend of Moto Bug and Crabmeat and lurks on rooftops in the Spring Yard Zone. Although its pink shell is easily recognized, it spiky rear and fearsome fore-claws make it one of the Zone's least desirable pets – unless you're a mad scientist, of course. It enjoys hanging its fore-claws over the edges of building for an unwary animals who may be jumping upwards. It can only be damaged by a hit to the head."
A Hermit crab type robot which has been newly developed for cold regions. The spines on its hard shell will repel any attacks done by Sonic alone. There must be another way to defeat it... 
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