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Not to be confused with the video game Sonic Lost World.

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Sonic Adventure
Lost World (Sonic)

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Sonic Adventure
Lost World (Knuckles)

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Lost World (ロストワールド Rosutowārudo?) is an Action Stage that appears in Sonic Adventure, Sonic Adventure DX: Director's Cut, and the 2010 remaster of the game. It is the ninth Action Stage played as Sonic and the fourth Action Stage as Knuckles. It is an underground world located inside and below the Shrine of Knuckles's race in the heart of the Mystic Ruins. As with most other Action Stages in its games, Lost World has different level designs for each character, which have three optional missions each.


Lost World is an abandoned world consisting of temple passages with large water streams and inflamed traps, including protruding bars and rolling boulders.

Lost World is divided into three main parts. The first is a long, maze-like section that ends with a flooded room where Switches must be pushed to open the door. The second is a dark passage with a waterfall and bolder running segment. The third and last one is a room with Lit Panels. Sonic goes through all three, while Knuckles goes through only the third.

In the enter of Lost World is a short area that has two small ponds with a stone mural of Perfect Chaos, destroying the ancient Knuckles Clan.


Sonic the Hedgehog

Knuckles the Echidna


Skill and timing is required to master Lost World. To make traveling in water easier, there is a Snake-like rocked version which can travel on the surface and into water. Some parts of the interior take place in a bottomless pit with some small platforms that cannot be seen without light. To light them on, a light projectiles system can produce some light in a part of these sections, which also includes mirrors that make the light reflected to light up the largest possible parts. There are also some puzzles to resolve in this part of the shrine.

Lost World features the exclusive Lit Panel gimmicks that allow the character to walk on walls. To walk on these panels, the player must connect a group of them with a nearby Switch and once they are lit, the character can walk on them.


Lost World can only be accessed in the Mystic Ruins Jungle Area, at the Shrine of Knuckles's race. In Sonic's story, Sonic can enter Lost World through the shrine's main entrance, which is designed like a serpent's mouth. This entrance opens during one of the cutscenes. In Knuckles' story, on the other hand, Knuckles enter Lost World through the back entrance on the shrine. To do this, the player has to take the gold statue and silver statue to the back of the temple and place them on matching plinths. After placing the gold and silver statues on their corresponding altars, a passage in the floor in the back of the shrine will open, which leads into Lost World.

Sonic the Hedgehog

Sonic travels through five successive sections in Lost World. The first section has a large swimming snake, which must be used to find three switches to open a door of stone snakes. The second section is a dark room where mirrors can be used to light it up. The third section has a waterfall, which leads to a pond with stepping stones resting in the water, followed by having to escape from a giant burning boulder headed straight for Sonic. The fourth section is a giant room, which must be slowly climbed up using the Lit Panels.

Level Mission

Knuckles the Echidna

Level Mission



  • There is a glitch in Knuckles' version of Lost World that allows him to access and complete Sonic's entire portion of this Action Stage. The player must punch one of the blocks before the fire comes out and Knuckles will glitch through; ironically, the same music is playing as in Sonic's music is completely different.
  • This is the only stage in Sonic Adventure that only two characters can access, as opposed to three in all other stages.
  • In Knuckles' version of Lost World, "Leading Lights ...for Lost World" is played instead of "Danger! Chased by Rock ...for Lost World", which is heard when Sonic goes through the same area. "Leading Lights ...for Lost World" also appears in Sonic's version of Lost World, but only briefly in the last room where the Perfect Chaos mural is located.
  • The stone mural of Perfect Chaos shows what the designers intended him to look like. It was not shown in Sonic Adventure due to Dreamcast's technological limitations. This design was later used in Sonic Generations.


Name Artist(s) Length Music track
"Tricky Maze ...for Lost World" Fumie Kumatani 2:31
"Danger! Chased by Rock ...for Lost World" Kenichi Tokoi 1:36
"Leading Lights ...for Lost World" Kenichi Tokoi 1:49



Sonic Adventure DX (GC) Sonic - Lost World Missions Level B and A


Sonic Adventure DX (GC) Knuckles Lost World Missions Level B and A


Main article | Scripts (Sonic, Tails, Knuckles, Amy, Big, Gamma, Super Sonic) | Story Screens (Sonic, Tails, Knuckles, Amy, Big, Gamma) | Credits | Glitches | Beta elements | Gallery | Pre-releases (original version, Limited Edition) | Re-releases (DX, 2010)