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Sonic News Network
Sonic News Network

The Labyrinth Zone boss is an object that appears in the Sonic the Hedgehog series. It is the Egg Mobile, created and first used by Dr. Eggman during the South Island incident.



The Labyrinth Zone boss looks identical to the standard Egg Mobile.

Features and abilities

The Labyrinth Zone boss is capable of flight.

Game appearances

Sonic the Hedgehog (16-bit)

In the original Sonic the Hedgehog, the Labyrinth Zone boss is fought at the end of Labyrinth Zone Act 3. In the original game, it is encountered by Sonic. In the 2013 re-release, it can also be fought with Tails and Knuckles.

This boss fight is perhaps the most unique one in the game, as the player has to climb through a tunnel filled with traps such as moving spears and statues spewing fireballs. Along the way, Dr. Robotnik will fly up in his Egg Mobile attempting to escape, while the water will keep rising.

Unlike the other bosses in the game, the player does not need to hit the boss eight times, although it is possible for them to do so. The Egg Mobile is also completely unmodified and without weaponry. Instead, it is more about surviving, as they have to avoid the various obstacles along the way while trying to escape from the water, which can make their character drown.

Once the player reaches the top of the passage, Dr. Robotnik will fly away, and the player will be able to open the Capsule and finish the Zone.


Name Artist(s) Length Music track
STH1 Boss 〜Mega Drive version〜 Masato Nakamura 1:23

Sonic the Hedgehog 4: Episode I

The encounter of the Egg Mobile is later seen again as a boss in Sonic the Hedgehog 4: Episode I at the end of Lost Labyrinth Zone. At the start of the boss act, the player has to pick up some rings and head to Dr. Eggman who, after laughing, flies away stage right. The route is more wheeling and smoother than before. Like its previous appearance, there are also numerous booby-trapped obstacles like spears, but there are also Badniks as well on the way. Despite the smoother platforming sections, the water once again rises below, while like in original Sonic the Hedgehog, there are no air bubbles on the route, as the player has to pass quickly as possible without drowning. The player is also able to attack the Egg Mobile by doing Homing Attack into it.

After being bounced to the air via spring, the player chases Eggman on the linear arena until the second phase of the boss battle starts and where the things start getting different. Eggman summons two pillars to rise from the ground, enclosing him and the player. Eggman then summons numerous different looking pillars slowly as attempting to crush the player, while the doctor himself flees to the safer place. The player has to head to the same place as well to survive and manage to hit Eggman at the same time. Eggman repeats doing this with different patterns until the player has defeated him, while the player should also memorize patterns and the doctor's moving directions.

After doing four hits into the Egg Mobile, all pillars disappear around the arena, while Eggman flees away with his damaged Egg Mobile. The player is then allowed to to open the capsule and complete the zone. This battle later reappears at E.G.G. Station Zone as a part of the boss rush before the final boss. While the chase section is not included, it moves to the newer part of the battle, where all pillar patterns are similar but replaced with high-tech ones to fit the space-themed zone. After another four hits, all pillars disappear and the player can move to the next boss.


  • Though the boss has gone unnamed so far, it has been named Doctor Eggman (ドクター・エッグマン[1] Dokutā Egguman?) or the Egg Mobile[2] in most official guides and books.
  • Before the player faces the boss in the original Sonic the Hedgehog, a Shield monitor is seen on left side of the cave, which can be helpful during the chase.
  • Strangely, in the iPod remaster of the original Sonic the Hedgehog, a glitch causes the water to stop rising at a certain point, making the chase significantly easier.
  • During the second phase in Sonic the Hedgehog 4: Episode I, the way the block pillars rise from the ground and the way Sonic has to stand on something to reach Eggman is similar to the Egg Hammer boss of Aquatic Ruin Zone in Sonic the Hedgehog 2.
  • In Sonic the Hedgehog 4: Episode I, it is possible to hit Eggman before the battle really starts, standing on one of the walls that rise at the beginning of the battle and quickly doing a Homing Attack into him.
  • In the Sonic the Hedgehog 4: Episode I variant of this boss, it is possible to defeat Eggman during the chase sequence if enough hits are inflicted. Defeating the doctor this way will cause him to not continue the battle with the second phase.




  1. "ソニック・ザ・ヘッジホッグ" (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. 39. ISBN 978-4091060907.
  2. Flynn, Ian; Sega (8 December 2021). Sonic the Hedgehog Encyclo-speed-ia. Dark Horse Books. ISBN 978-1506719276. "Boss: Dr. Eggman flees through the flooding maze in his Egg Mobile."