MM4WilyCastleConcept.jpg (434 × 285 pixels, file size: 21 KB, MIME type: image/jpeg)
Concept art of the Mega Man 4 Wily Castle from the book Mega Man Official Complete Works. Image from the Spanish Mega Man wiki.
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The Wily Castle (ワイリー城) in Mega Man 4 appears after Mega Man defeats Dr. Cossack in his citadel...