Most games fall into the action-adventure genre, making it the most crowded of all our categories. That crowding didn't make our choice particularly easy, since fans of action-adventure games had a ton of amazing games to choose from, including our five nominees for the 2001 Best Action-Adventure Game Award:
Nominees:

Castlevania: Circle of the Moon

Publisher: Konami
Developer: Konami
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Circle of the Moon is a game that really picks up where Symphony of the Night left off and stands out as one of the best portable adventures ever created.
Devil May Cry

Publisher: Capcom
Developer: Capcom
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Perhaps for the first time in the 3D action genre, Devil May Cry has successfully captured the twitch-based, relentlessly free-flowing gameplay style of so many classic 2D action games.
Grand Theft Auto III

Publisher: Rockstar
Developer: DMA Design
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Rockstar's latest Grand Theft Auto game reinvents the series, updates it for a new generation of consoles, and manages to keep every single positive aspect from the two previous games.
Resident Evil Code: Veronica X

Publisher: Capcom
Developer: Capcom
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Resident Evil Code: Veronica X is clearly the best game yet produced for the survival-horror subgenre of adventure gaming.