Wily Castle (Mega Man 4)

The Wily Castle (ワイリー城) in Mega Man 4 appears after Mega Man defeats Dr. Cossack in Dr. Cossack's Citadel and learns from Kalinka, who is brought to the scene by Proto Man, that her father was forced to work for Dr. Wily's plans. Wily shows up to argue with Proto Man for betraying him and taunts Mega Man, running away to his Wily Castle. Mega Man follows him and ultimately goes up against Dr. Wily.

Stage 1
The first section is littered with Mets and features almost nothing but multiple forms of this recurring enemy in the indestructible hard hat. Even the final boss is a giant version of this common enemy.

Enemies

 * Garyoby
 * Metall Dance
 * Metall EX
 * Metall Swim
 * Boss: Metall Daddy

Stage 2
The main hall of the castle, which is full of split paths to take and more recurring enemies.

Enemies

 * Battonton
 * Docron
 * Gachappon
 * Garyoby
 * Imorm
 * Mono Roader
 * Mummira
 * Taketento
 * Boss: Tako Trash

Stage 3
This is a short stage that is mostly a vertical drop that leads to capsules containing rematches with the eight Robot Masters, followed by your first battle with Dr. Wily.

Enemies

 * Garyoby
 * Minoan
 * Shield Attacker
 * Rematches with the eight Robot Masters
 * Boss: Wily Machine 4

Stage 4
The final level, even shorter than the previous, through the castle basement, en route to your final battle with Dr. Wily. After his defeat, Wily escapes and sets the Wily Castle to self-destruct. Mega Man teleports out of the fortress to avoid the explosion.

Enemies

 * Imorm
 * Boss: Wily Capsule

Rockman 4 (manga)
After Mega Man defeats Dr. Cossack and Proto Man rescues Kalinka, Dr. Wily appears and runs to his research laboratory. Mega Man follows him, facing several robots inside before finding Dr. Wily.

Mega Man Gigamix
In the manga, Wily has a fortress similar to the Mega Man 4 Wily Castle named Wily City (ワイリーシティ). It is located in an skull-shaped island that is destroyed by a white alien robot.