Mr. X's Castle

Mr. X's Castle, known as the X Foundation Headquarters (エックス財団本部ビル) in Japan, is the fortress used by "Mr. X" in Mega Man 6 and the location of the four Mr. X Stages (エックスステージ). Mr. X's Castle consists of four parts, each part being a level Mega Man must go through. The same song plays for all Mr. X Stages. The final part of the fortress ends with a battle between Mega Man and Mr. X.

Mr. X Stage 1
The first level in the series of Mr. X Stages. Mega Man begins outside of the castle, attempting to break inside. A lot of the level involves climbing upward, avoiding spikes and an abundance of Cannopellers.

Enemies

 * Batabattan
 * Cannopeller
 * Cyber Gabyoall
 * Hotchkissn
 * Shield Cannon
 * Skull Walker
 * Wall Blaster 2

Boss: 'Rounder 2

Mr. X Stage 2
The second Mr. X stage. It has a space feel, with large windows that give the player a view of the night sky. The level contains a large amount of Mets, as well as Skull Walkers in the later parts of the stage. There is also no vertical scrolling at all, making this level like a hallway of the fortress.

Enemies
Enemies:
 * Hotchkissn
 * Met
 * Moler
 * Skull Walker

Boss: Power Piston

Mr. X Stage 3
The third Mr. X stage, a boiler area.

Enemies
Enemies:
 * Fire Telly
 * Cyber Gabyoall
 * 
 * 

Boss: Mettonger Z

Mr. X Stage 4
The fourth and last Mr. X stage, an area that seems to be used for robot production.

Enemies
Enemies:

Boss: Mr. X (inside X Crusher)