Sonic News Network

Know something we don't about Sonic? Don't hesitate in signing up today! It's fast, free, and easy, and you will get a wealth of new abilities, and it also hides your IP address from public view. We are in need of content, and everyone has something to contribute!

If you have an account, please log in.


Sonic News Network
Sonic News Network
For other uses of the term, see Big Arm (disambiguation).

Big Arm (ビッグアーム[1] Biggu Āmu?), or Big Arms,[2] is a vehicle that appears in the Sonic the Hedgehog series. It is a modified, combat-oriented Egg Mobile created by Dr. Robotnik. The vehicle was used by its creator to defend his Death Egg during its first re-launch from Angel Island.



Big Arm is a heavily armored, egg-shaped Egg Mobile. Significantly modified compared to the regular Egg Mobile, it possesses two giant mechanical arms on the sides. These arms are gray with red shoulders, wrists and finger joints. It also possesses a windshield and a red canopy with gray spikes on top of it, and two small red thrusters on its back.

Modern depictions of Big Arm depict it with retractable spikes on its forearms, red shoulder disks, and red plating on top of its fingers and knuckles.

Powers and abilities

Big Arm is able to hover or fly through the air using the thrusters on its back. Its arms also give this vehicle the ability to grab its opponents and throw them into the ground with lethal force, enough to harm even Super Sonic in Sonic the Hedgehog 3.


Sonic the Hedgehog 3 & Knuckles

In Sonic the Hedgehog 3, when Sonic the Hedgehog got onboard the Death Egg during its first re-launch from Angel Island, Dr. Robotnik returned to defeat Sonic using excessive force (which meant using Big Arm and other vehicles to fight Sonic). However, that force proved to be Robotnik's undoing. As Sonic defeated Big Arm, the Death Egg succumbed to the damage Sonic's fight with Robotnik had inflicted on it, causing it to crash-land on Angel Island once more.[3]


Big Arm is the third and final boss of Launch Base Zone Act 2 in Sonic the Hedgehog 3 as well as the fourteenth and final boss overall in that game. In Knuckles' story in Sonic the Hedgehog 3 & Knuckles, it is the second and final boss of the said act and the twelfth boss overall in that game.

In Sonic the Hedgehog 3, Big Arm is fought with Sonic or Tails. In Sonic the Hedgehog 3 & Knuckles, it is fought by Knuckles only. In both cases, the Big Arm is fought directly after defeating the Egg Rocket.

Boss guide

The arenas where the Big Arm is fought at is the same respective locations as with the Egg Rocket. The battle commences after Robotnik or the EggRobo on the Big Arm vertically descend through the screen. The first phase of the Big Arm's attack pattern consists of the Big Arm swooping horizontally across the screen with variations on its path. If the player jumps into the Big Arm's hands, the Big Arm will grab and immobilize the player, roll them into their Spin Attack and then slamming them down into the center of the arena upon which they will take damage and the Big Arm will fly away while resuming the remainder of its attack pattern. Normally, the player's only opportunity to attack this boss is when it swoops across the screen. Because the Big Arm has spikes on the top of its cockpit and wide arms below, Big Arm has a limited amount of space where it can be safely attacked. The player must use a well-placed Spin Jump to attack the cockpit; too high and the character will hit the spikes, too low and they will be grabbed by the hands. While playing the standalone Sonic the Hedgehog 3, using the Insta-Shield is an effective tactic for Sonic. After the Big Arm gets hit while swooping across the screen, it will fly directly towards the corner.

After swooping across the screen two times, the Big Arm commences the second phase of its attack pattern where it will appear on top of the screen and fly horizontally back and forth several times. It will pause for a brief moment before descending below the arena and repeat the same movement, requiring the player to jump over the Big Arm to avoid contacting with it. Afterwards, the Big Arm will pause for a brief moment before flying upwards and then repeating its attack pattern from the first phase. While it is flying across the screen below the arena, the player cannot damage it though it is possible to damage the Big Arm by a well-timed jump just while it descends and also after it finishes this attack depending on its position.

It takes eight hits to destroy this vehicle, after which Big Arm will be destroyed, and Eggman with the Egg Mobile will fall from the arena. The explosions from Big Arm will start to affect the Death Egg itself and the arena along with Sonic/Tails will be detached from the space station. The player will see the destruction of Death Egg in the background, thus ending the first part of Sonic the Hedgehog 3, and the game will then progress to the end credits.

When fighting the Big Arm as Knuckles in Sonic the Hedgehog 3 & Knuckles, the Big Arm's now swoops across the screen four times in the first phase of its attack pattern before the second phase commences. After defeating the Big Arm, the player can hit the Capsule descending from the top of the screen as it moves horizontally across the arena to finish the act. Also, Knuckles does not get harmed by the Big Arm while in his Super State.


Name Artist(s) Version Length Music Track
"Boss The Boss" Sega Sonic the Hedgehog 3/Sonic the Hedgehog 3 & Knuckles 1:50
Sonic & Knuckles Collection "FM Synthesizer" 1:42
"General MIDI" 0:57

In other media

Books and comics

Sonic the Comic

Main article: Squeeze Tag Machine

Robotnik piloting the Squeeze Tag Machine in Sonic the Comic.

In Sonic the Comic, Dr. Robotnik pilots the machine, here referred to as the "Squeeze Tag Machine", when he invades Sonic's Secret Underground Base in Emerald Hill Zone. The "Squeeze Tag Machine" is built so solidly that Sonic cannot damage it. Luckily, he is helped by Knuckles, who cracks the small windscreen with a punch, weakening it enough for Sonic to tear the top of the machine off.

Archie Comics

Main article: Big Arm (Archie)

The Big Arm, from Sonic the Hedgehog #276.

In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, Big Arm appeared in Sonic the Hedgehog #276, where it was piloted by Dr. Eggman in his effort to rescue Metal Sonic from the Distant Abyss Zone.






  1. (in Japanese) ソニック・ザ・ヘッジホッグ3 公式ガイドブック. Shogakukan. 1 July 1994. p. 75. ISBN 978-4091024794.
  2. Sonic the Hedgehog (January 24, 2019). Sonic Mania Adventures Special Remix - "Big Arms" by Tee Lopes & Jun Senoue. YouTube.
  3. Sonic The Hedgehog 4. Sega. Archived from the original on 12 May 2013. Retrieved on 27 October 2017.

Main article (Sonic 3 & Knuckles) | Staff | Manuals | Glitches | Beta elements | Gallery