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Sonic News Network
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Dr. Eggman bores his way into the ceiling with the Egg Digger, causing cave-ins.

— Description, Sonic the Hedgehog Encyclo-speed-ia

The Egg Digger[1] (ドリルエッグマンII[2] Doriru Egguman II?, lit. "Drill Eggman II") is an object that appears in the Sonic the Hedgehog series. It is a modification of Eggman's Mobile created by Dr. Robotnik, who used it during the West Side Island incident.



The Egg Digger looks almost identical to the standard form of Eggman's Mobile, except that it has two drills connected to yellow "arms" with red stripes and a thruster underneath it.

Features and abilities

The Egg Digger is capable of flight. It can also turn its drills vertically or horizontally, and it can use them to burrow through stone with no problem.


Sonic the Hedgehog 2

In Sonic the Hedgehog 2, the Egg Digger was used by Dr. Robotnik to fight Sonic and Tails in Mystic Cave Zone. However, the Egg Digger was destroyed by the duo, forcing Robotnik to flee.


The Egg Digger is the boss of Mystic Cave Zone Act 2 in Sonic the Hedgehog 2, its various ports and remasters, and the lock-on game Knuckles the Echidna in Sonic the Hedgehog 2; and the sixth boss overall in these games. It is also the sixth boss of Boss Attack Zone in the 2013 remaster of the game. In the original Sonic the Hedgehog 2, the Egg Digger is fought with Sonic and/or Tails, while in Knuckles the Echidna in Sonic the Hedgehog 2 and the 2013 remaster of the game, it can also be fought with Knuckles.

In the 2013 remaster of Sonic the Hedgehog 2, the Egg Digger is one of the two sixth bosses in the game, along with Brass Eggman. It is possible to skip this boss fight if the player goes to Hidden Palace Zone in Mystic Cave Zone Act 2.

Boss guide

The player encounters the boss vehicle on an empty hallway, where no one is seen. When the battle begins, the screen rumbles, round and spiky rocks fall from the ceiling and Robotnik himself arrives with his upgraded Eggman Mobile with two drills. When the rocks start falling down, the player must dodge the spiky ones as they can damage the player when touched. After arriving, Robotnik will drill though the ceiling with his drills in a vertical position. He will then shift his drills in a horizontal position and attempt to ram into the playable character. After this, he will return into the ceiling and the process will start over, repeating the pattern again. The player has to also avoid touching the drill and motor parts of the vehicle and attack when Robotnik is not pointing them in the vertical position.

The Egg Digger takes eight hits to defeat, after which the player can open up the Capsule and finish the Zone.


Name Artist(s) Length Music track
"STH2 Boss 〜Mega Drive version〜" Masato Nakamura 2:14





  1. Flynn, Ian; Sega (8 December 2021). Sonic the Hedgehog Encyclo-speed-ia. Dark Horse Books. ISBN 978-1506719276. "Boss: Dr. Eggman bores his way into the ceiling with the Egg Digger, causing cave-ins."
  2. (in Japanese) ソニックメガコレクション最強攻略ガイド. Shogakukan. 1 March 2003. p. 85. ISBN 978-4091060907.

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