The typical Crawls have a rotund, grey torso with a vent on their belly and a neckless red or orange head with insectoid mandibles and two large eyes. Possessing short limbs, they have a yellow crab-like pincer on one arm while the other wields a Bumper with a red background, blue center and yellow/white star in it.
There are several changes to the Crawl's design which are made in Sonic Rivals 2, Sonic the Hedgehog 4 and Sonic Generations.
Powers and abilities
As being mentioned earlier, Crawl Badniks can basically defend themselves by using their shields on left hand, while the player gets bounced back like bobbins at pinball sections. However these Badniks don't simply attack to its target while moving slowly back and forth (it is still possible to hit them by simply running into it). However Crawl does not have protection at back section and which is fatal flaw of these Badniks.
In Nintendo 3DS version of Sonic Lost World, Crawl has given ability to create projectile wave towards its target. Waves that Crawl is able to are similar to ones that Sonic can do with Somersault Kick. Crawl spins around once while his Bumper shield and claw arms are relaxed.
Sonic the Hedgehog 2
Crawl made first appearance in Sonic the Hedgehog 2, as being featured at Casino Night Zone and making the only enemies in that particular zone. Crawl is seen crawling slowly (hence the Badnik's name) back and forth on routes. If the player tries to defeat the Badnik in front or above sides, Crawl hides under the shield which bounces the player to backwards, while making no damage to player or Badnik. Crawl can only be destroyed by performing a Spin Attack from behind.
A single Crawl appears in 16-bit version of Sonic the Hedgehog Spinball, as it is seen behind two Cluckers at pinball table of fourth Bonus Stage "Clucker's Defense". In this bonus stage, the player has to destroy Crawl from table by using three balls at the same time.
It is impossible to hit them in front as the pinball balls can be bounced from Badniks, while giving 1,000 points from one hit. The player has to defeat Crawl from lateral sides multiple times until it lost its shield and with the last hit, it gets destroyed. Oddly this Crawl doesn't have animal inside of it.
Sonic Rivals 2
A different looking Badnik, that looks like Crawl is seen in Sonic Rivals 2, renamed Guardon Crab. These Badniks are created by Dr. Eggman, but Eggman Nega has taken over the control of the Guardon Crabs and the other Badniks. These Guardon Crabs appear in Neon Palace Zone and Chaotic Inferno Zone. Though this version has same attack pattern like Crawl, it can be destroyed simply by jumping at it, even from the front. The collectible card for the Guardon Crab can be obtained by completing Mystic Haunt Zone Act 2 with an S rank.
Sonic the Hedgehog 4
Crawl makes reappearance in Sonic the Hedgehog 4, as these Badniks return with slightly different models at Casino Street Zone. Unlike in Casino Night Zone, Crawl is not alone while the zone also has Batbots and Bubbles as well. However the attack pattern of Crawl is almost the same from previous games and having also animal inside of it once again.
Crawl make another appearance in Nintendo 3DS version of Sonic Generations, as Badniks are seen at Casino Night Zone. Crawl appears to have same attack pattern from previous appearances, but doesn't have animals inside of it at all. Modern act of the zone features Crawl Badniks at lines and looking to the other side, as the player can use boost to go through.
Sonic Lost World
Crawls appears in both versions of Sonic Lost World. During the game, the Crawls and the other Badniks got hijacked by the Deadly Six. Ín this game, the Crawls appear to retain their original appearance from Sonic the Hedgehog 2, though the Crawls here have grey back armor with a yellow orb on the armor.
In Wii U version of the game, Crawls are guarding Frozen Factory Zone 3, Silent Forest Zone 4 and Lava Mountain Zone 3. The player cannot attack the Crawls from the front, so the player has to try hit them from behind where they have no protection. In Nintendo 3DS version of the game, they are seen in Sky Road Zone 1 and 2. Crawls in the Nintendo 3DS version have the ability to create projectile waves towards the player, which are similar to ones Sonic uses when performing Somersault Kicks. If the player performs the Somersault Kick at right time, he/she can block the Crawl's wave and stun at the same time, leaving them open to a Homing Attack.
In the Sonic the Comic series published by Fleetway Editions, the Rollers are a part of Dr. Robotnik's Badnik army, although they only appeared a few times over the series' run. Depending on the artist, the Crawls' design would be altered slightly each time.
There are alternative in-game sprites in the Simon Wai prototype of Sonic the Hedgehog 2 that exist inside of the game's coding. Crawl has different position and holds the shield to the lateral direction, while it doesn't do this in final version. It is also noticed that its pincer is a grey color.
Crawl's pincers are also seen miscolored grey in mini-game of Sonic the Hedgehog Spinball.