This Badnik prefers underground areas which are well suited for his unique talents. Be on the lookout as Burrobots have a habit of jumping out of the ground! — Profile, Sonic the Hedgehog 4: Episode I website
Burrobots are seemingly loosely based on European Mole. They have a blue body consisting of a round torso and a large head with round black eyes, gray disks for ear pieces and a large gray cone-shaped drill bit for a nose. On their head they wear a yellow hard hat. Their chest is gray, their shoulders are yellow and round, and their two arms are gray with three sharp fingers on each hand. As legs, they have tracked wheels on each side, which runs between two wheels; one is small and one is bigger.
Burrobots in Sonic the Hedgehog 4: Episode I are more detailed. The ear pieces have red bottom placed screws and their tracked feet have a elastic bands between their wheels. In Sonic Lost World, they wear yellow goggles while digging.
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 Burrobot (モグリン,Mogurin?). In this game, the player encounters them in Labyrinth Zone and Scrap Brain Zone Act 3.
In gameplay, Burrobots appear either alone or in groups, usually hiding beneath the floor and waiting to pop out to attack Sonic when he gets close to them. Their noses can be seen poking out of the ground so it is easy to spot where they will pop out of to attack the player. Othereise, they roll slowly along the ground and can climb up higher ledges almost instantaneously. As they jump out of the ground, the player can use a well-timed Spin Jump to defeat them, when they roll along the floor, they can be taken out with a Spin Attack. Also, upon their defeat, they release an Animal and reward the player with 100 points.
Sonic the Hedgehog (8-bit)
In Sonic the Hedgehog (8-bit), Burrobots appear as enemies, but only in Labyrinth Zone. Otherwise, they have the same attack pattern as their 16-bit counterparts; they jump out of the floor when Sonic approaches, roll slowly along the ground, and can climb higher ledges in an instant. However, Burrobots, along with the other Badniks in the game, do not have Animals inside of them. Regardless, upon their destruction, they reward the player with 100 points.
In gameplay, the Burrobots behave much like they did in the original Sonic the Hedgehog: they pop out of the ground when the playable character approaches, and when on the ground, they move along it slowly. They can also climb up onto higher ledges in a near instant. Regardless, they are destroyed when hit once by any of the playable characters' attacks. Also, upon their destruction, they release an Animal and reward the player with 100 points.
Sonic Lost World
In the Wii U/PC version of Sonic Lost World, Burrowbots have their original design. During the game, it turns out that the Badniks, including the Burrobots, got hijacked by the Deadly Six.
In this game, Burrobots appear in the wide-spaced sections of Frozen Factory Zone 1, waiting for Sonic to approach. When they pop out of the ground to attack the player, they often end up getting stuck in the ground with their drill nose. The Burrobots also appear in the underground section of Silent Forest Zone 4 where they will chase the player while they are using the Yellow Drill. However again, this Badnik can get stuck on floating stone circles should it collide with it. The player can defeat it by ramming into its non-drill spots with the Yellow Drill.
Mario & Sonic at the Rio 2016 Olympic Games
In the Nintendo 3DS version of Mario & Sonic at the Rio 2016 Olympic Games, Burrobots make a cameo appearance as walls during the Golf Plus event on Hole 9, where they use their sprite appearance from the original Sonic the Hedgehog. If the playable character's golf ball hits a Burrobot wall here, it will disappear and the golf ball itself will land safely on the lawn without falling onto unfavorable terrain.
Burrobots uses their nose-based drills to burrow through the ground. There, they remain hidden beneath the enemies' feet, waiting until the enemy is close enough. Burrobots then attack to from underground with their noses facing upwards.
Burrobots also frequently appeared in early issues of Fleetway's Sonic the Comic, as members of Doctor Robotnik's Badnik army. Because of different artists, Burrobots have different looks in the stories. However as Robotnik has designed new digging Badnik models, Burrobots mostly have been replaced. At one time Shorty the Squirrel's friend Hopper actually turned into a Burrobot until he was freed soon after when Shorty turned against Robotnik. Also at one time Tails disguised himself as a Burrobot.
In the Sonic X comic series published by Archie Comics, Burrobots appeared in a virtual reality version of the Labyrinth Zone to ambush Sonic and his crew. The group, however, managed to get pass them.
Tomy made a Burrobot figurine as part of a Sonic & Knuckles set, which included twenty other figurines of characters and Badniks.
The Burrobots' Japanese name, "Mogurin", is a combination of the words "Mogura", which is Japanese for "mole", and "moguri", which is Japanese for "diver".
In both the 16-bit and 8-bit version of Sonic the Hedgehog, some of the Burrobot's exterior armor is shown to be red, instead of yellow as shown in the artwork due to palette issues. The upgraded appearance of the Burrobots in Sonic the Hedgehog 4: Episode I uses artwork colors with detailed mechanic parts being colored red.