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In the anime series Sonic X, the Final Egg was Dr. Eggman's hidden base in the Mystic Ruins. After the Egg Carrier's crash and an unsuccessful attempt to destroy tation Square, Eggman returned to the Final Egg to devise a new strategy. Sonic, however, follows Eggman to the Final Egg. There, Sonic destroyed the gate leading into the Final Egg. After then avoiding numerous traps set by Eggman, Sonic reached the center of the Final Egg. There, he fought the Egg Viper, eventually defeating Eggman and destroying the Final Egg.
In the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing, the Final Egg is one of Dr. Eggman's bases. Its past is virtually identical to its game counterpart's, up until after the events of Sonic Forces. This one in particular was used by Dr. Starline, who had Rough and Tumble bring an amnesiac Eggman here in order to restore his memories. After recovering, Eggman prepared the Metal Virus in the Final Egg lab, but later transferred his operations to the Faceship.
Near the end of the level, there is a particularly slow-moving platform which leads to four extra lives. This was most likely intended as preparation for the battle with the Egg Viper within the level itself. In the final game, the battle was split from the level (so progress is saved), so the extra lives are unnecessary. However, they were possibly left there for the player to discover.
Beyond the capsule, there is an unused tunnel that is blocked off, but it can be accessed using the Light Speed Dash. It was intended to trigger the cutscene for the Egg Viper battle within the level itself. However, in the final game, the battle was split from the level. As a result, a capsule was implemented and the area was sealed off, probably due to the difficulty of the level.
An unfinished duck Badnik was intended for this level, but completely removed in the final game. It can be found in pre-release copies, where it shoots at the player and attempts to run away.
A Sonic doll appears in Gamma's story, and he is required to shoot it as commanded by Dr. Eggman.
This is the only Action Stage in Sonic Adventure that reuses a theme first heard in an Adventure Field, as the area leading into Final Egg plays the same music ("Mechanical Resonance ...for Final Egg") and one of only two Action Stages that use a single theme in more than one section in the same Action Stage, being the theme for the first and third sections as Sonic (the other being Sky Deck using "Skydeck A Go Go! ...for Sky Deck" in the first and second sections as Sonic).