Though they were not in extreme abundance, this year's various shooters were characterized by their generally outstanding quality. Never before have there been so many excellent, broadly appealing action games in a single year. Though multiplayer action is an ever-growing genre--for many players, it's already replaced conventional single-player action--this year's single-player action games featured countless impressive moments. Here are the nominees for Best Single-Player Action Game of 2001:
Nominees:

Aliens vs. Predator 2

Publisher: Fox Interactive
Developer: Monolith Productions
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It's better than the original Aliens vs. Predator, and it's one of the best action games released this year.
Clive Barker's Undying

Publisher: EA Games
Developer: EALA
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Undying has superb graphics, truly impressive sound effects, and fast-paced, enjoyable action sequences. The entire game is very atmospheric and a lot of fun to play.
Max Payne

Publisher: GodGames
Developer: Remedy Entertainment
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It's an outstanding and original action game that's not just different from all other shooters to date, but also in many ways superior.
Operation Flashpoint: Cold War Crisis

Publisher: Codemasters
Developer: Bohemia Interactive
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The setting is perfect shooter material, and Operation Flashpoint does justice to it with complex gameplay coupled with a huge and truly memorable gameworld.
Serious Sam: The First Encounter

Publisher: GodGames
Developer: Croteam
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It's a great looking, fun-filled game that has plenty of visceral thrills and absolutely, positively the biggest battles in any shooter to date.