N3: Ninety-Nine Nights, or simply Ninety-Nine Nights, is a fantasy hack and slash video game developed exclusively for the Xbox 360 by an alliance between Q Entertainment and Phantagram. Phantagram is a South Korean based developer noted for creating the Kingdom Under Fire series. Q Entertainment is a Japanese developer best known for its Lumines and Meteos series. Video game designer Tetsuya Mizuguchi served as producer for the game. The game features hundreds of enemies onscreen at any given time, and borrows heavily from other video games of the genre, most notably from the Dynasty Warriors series and the two Kingdom Under Fire games.

The game was released in Japan on April 20, 2006, in North America on August 15, 2006 and in Europe on August 25, 2006.

A demo of Ninety-Nine Nights was released on a DVD-ROM as a pre-order bonus in Japan, and on July 28, 2006, one was released on the Xbox Live Marketplace. The demo is free and available in all regions.

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