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This stage takes place deep within Dr. Eggman's pyramid base, filled with bonfires, Badniks, and a large machine in the center.
After locating the entrance to Dr. Eggman's pyramid base, Sonic and co. find that the door to a shuttle that will take them to the Space Colony ARK, is locked. Sonic persuades Knuckles to find the three keys to the door so they may proceed.
This level, like some others in the game, has a large number of ghost-based enemies in it. It features many timed doors which can be temporarily opened by flipping an Hourglass. There are also paintings which Knuckles can Dig through.
Simplistic maps can be found on some of the walls, and depict the various sections of the stage in the same colors those locations are actually tinted. The player's current location is denoted by a glowing white dot.
After grabbing the six Rings in front of Knuckles at the beginning, the player should head for the blue section of the stage. They can play the Mystic Melody at the Ancient Ruin to make fourteen Rings appear. From there, they should keep traveling toward the blue section, where a Magnetic Shield will be in the room just after the metallic hallway. By arming Knuckles with this power-up, collecting the remainder of the Rings will be much easier.
3rd Mission: Find the lost Chao!
The player should play the Mystic Melody atop the Ancient Ruin on the floor of the Pyramid Core and then dive into the water when the hatch opens. As they swim down, they should see a closed door. They must swim to the other side of the room and find the Hourglass, flip it, then quickly go through the door before it closes. Once the player has made it through, they should swim across one hallway where two robots are firing, then another hallway lined with Boos. Once they enter the large cavern, they should swim up almost immediately to emerge from the water.
The player should climb out to see an Hourglass in the alcove above. This opens the door directly above it, and behind that door is the lost Chao. The player will not be able to Climb straight up to the door, so they must hit the Hourglass and work their way upwards before the door closes.
4th Mission: Find the 3 Keys within 5 minutes 0 seconds!
This stage can be a bit confusing due to its layout, so the player should not be afraid to use a Hint Box for hints.
Last Mission: Clear Hard mode!
The three Keys needed to complete this stage are found in pre-set locations, and are as follows:
To find the first Key, the player should begin by Digging through the painting found in the hallway between the red and green sections of the stage. They will then enter a large room with an Hourglass on the opposite side. The player then has to flip the Hourglass to make platforms slide out from the left and right-hand walls, and should then jump onto one of them and smash the Steel Containers to reveal another Hourglass. Next, they must flip that Hourglass to make the large hatch in the center of the room open. Now, the player should quickly run down and Dig into the dirt there to reveal the Key.
For the second Key, the player must head for the location of the lost Chao. Once they reach the large cavern, however, they must not Swim up to the room above., and instead go straight ahead where they will find the key behind an altar. However, be cautious as there are Unidus hidden there as well.
After the last Key, the player must swim up into the room where they found the lost Chao. A giant Weight should fall on the player and close off the entrance to the water. First, the player must Climb straight up and hit a Ball Switch to raise the Weight again. After that, they have to flip the Hourglass in the alcove below and quickly dive back down. For a brief time, the Key will be revealed in an alcove on the second step from the bottom.
In Death Chamber, Big is normally seen beyond the grating of E-01, from the red room's exit position. In the Hard Mode version of the stage, he has been moved slightly to the left from his previous position and downward.