Final Egg (Sonic X)

The Final Egg is a location that appears in the Sonic X anime.

History
Having been built in secrecy, Sonic knew nothing of the Final Egg's existence until he followed Eggman there after visiting the Mystic Ruins. Upon first seeing the entrance, Sonic spin dashes into it, breaking the entrance and invading the base.

As an alarm goes off, Sonic breaks a nearby security camera, prompting Eggman to set off several lasers in an attempt to stop Sonic, although all of them are easily avoided by the blue hedgehog.

Eggman's next trap within the Final Egg that he uses on Sonic causes the floor underneath Sonic to turn into spinning tubes, preventing him from running further. Eggman then sends a huge boulder towards Sonic in an attempt to flatten him. Sonic spin dashes into the boulder, using it's force to launch him forward and out of the trap, allowing him to run like normal again.

Bokkun is then sent to deliver a message from Eggman to Sonic, where Eggman challenges Sonic to a battle in the deepest section of the Final Egg. Here, Eggman uses the Egg Viper to do battle against Sonic, and like all of his traps prior, Eggman loses this battle, causing the Final Egg to burst into flames upon the destruction of the Egg Viper. Eggman then flees in his Egg Mobile with Sonic giving chase.

Trivia

 * Unlike it's game counterpart, the Final Egg is a hidden base rather than being in the wide upon. It is also not a tower, but more of a dungeon.