Castlevania: Circle of the Moon is a 2001 action RPG developed by Konami Computer Entertainment Kobe for the Game Boy Advance, later available on Wii U. Rather than following the linear, stage-based structure of earlier Castlevania titles, it adopts the interconnected castle design introduced in Symphony of the Night, where protagonist Nathan Graves explores a single continuous version of Dracula's castle. As Nathan uncovers artifacts throughout the environment, he unlocks new traversal abilities that open previously inaccessible areas. Combat centers on the Killer Whip as Nathan's sole weapon, though players can collect and equip various armor pieces and accessories to adjust his stats. The game's defining mechanic is the Dual Set-up System, which lets Nathan combine pairs of cards to produce distinct magical effects — pairing a fire card with a whip card imbues the weapon with fire, while combining a fire card with a summon card calls forth a fire demon to attack enemies on screen.
Taking place in 1830, Circle of the Moon is set in one of the fictional universes of the Castlevania series. The premise of the original series is the eternal conflict between the vampire hunters of the Belmont clan and the immortal vampire Dracula. Circle of the Moon's protagonist, however, is Nathan Graves, whose parents died a decade ago to banish Dracula. Morris Baldwin, who helped in Dracula's banishment, trained him to defeat Dracula and the monsters; Morris ultimately chose him as his successor and gave him the "Hunter Whip", to the displeasure of Hugh, Morris' son who trained alongside him. At an old castle, Camilla, a minion of Dracula, revives him, only to be interrupted by the arrival of Morris, Nathan, and Hugh. Before they are able to banish him again, Dracula destroys the floor under Nathan and Hugh, causing them to plummet down a long tunnel. Surviving the fall and wishing to find his father, Hugh leaves Nathan behind. Nathan proceeds to search the castle for his mentor. Along the way, he learns that at the next full moon, Morris' soul will be used to return Dracula to full power. He also periodically encounters Hugh, who becomes more hostile as the game progresses. Eventually, Nathan encounters Camilla, who hints that she and Dracula are responsible for the changes in his personality. Nathan vanquishes Camilla in her true form and meets up with Hugh once more. Upon seeing him, Hugh immediately attacks him with the goal of proving himself to his father through Nathan's defeat; Nathan, however, realizes that Dracula is controlling Hugh. Nathan defeats him, and Dracula's control over Hugh breaks. Confessing that he doubted his self-worth when Nathan was chosen as successor, Hugh tasks him with Morris' rescue. Arriving at the ceremonial room, Nathan confronts Dracula, who confirms that he had tampered with Hugh's soul to cause the changes in his personality. They begin to fight and halfway through, Dracula teleports away to gain his full power. Hugh then frees his father and tasks Nathan with Dracula's banishment. Nathan continues the battle and defeats Dracula; escaping the collapsing castle, he reunites with Morris and Hugh. Nathan is declared a master vampire hunter by Morris. Hugh vows to retrain under Morris due to his failure.
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