Ninja Reflex uses a series of martial arts challenges to test gamers' reflexes and measure their reaction times with millisecond precision. As players develop their ninja skills, they will strive to earn a black belt from their own personal Sensei. Players can also compete for ninja supremacy against their friends in fierce multiplayer battles with up to four players.

Ninja Reflex: Steamworks Edition makes use of Steamworks, Valve's recently released suite of development and publishing tools. Among other exclusive features, the Steamworks edition of Ninja Reflex offers a wide array of achievements. As players attain new belt ranks and their skills increase, they can earn over 50 achievements, the most of any game on Steam to date. Ninja Reflex: Steamworks Edition also features a special "basket" of Easter Eggs from the universe of Half-Life and Portal.

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