Final Egg

Final Egg (ファイナルエッグ) is an action stage from the game Sonic Adventure and Dr. Eggman's secret base hidden deep in the jungle of the Mystic Ruins. It is played as the first stage in Gamma's storyline, the third in Amy's storyline, and is the final stage in Sonic's storyline. This is also the birthplace of Gamma.

Trivia

 * Near the end of the level, there is a particularly slow-moving platform which leads to ladders containing four extra lives. It was most likely to prepare for 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 which can be accessed using the light speed dash. It was intended to trigger the cut-scene 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 sealed off, probably due to the difficulty of the level.
 * A Sonic doll appears in Gamma's Story, requiring him to shoot it, as commanded by Dr. Eggman. The Sonic doll also appears in Sonic X, where the E-Series use the Sonic doll to train in the Egg Carrier.
 * In tubes in the room where the zone Final Egg is reached, Metal Sonic and a altered version of Silver Sonic can be seen. One of the missions in Sonic Adventure DX requires the player to bring the burger statue to Metal Sonic.
 * In Amy's level at the end where it's required to choose a path, if one were to go in the wrong direction, the monitor changes between an Eggman Symbol and what looks like a Pokeball from the Pokemon series.