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In page Duke Nukem 3D:

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The shareware version of the game was originally released on January 29, 1996, while the full version of the game was released on April 19, 1996.[citation needed] The Plutonium PAK, an expansion pack which updated the game to version 1.4 and added a fourth eleven-level episode, was released on October 21, 1996. The Atomic Edition, a standalone version of the game that included the content from the Plutonium PAK and updated the game to version 1.5, was released on December 11, 1996. An official fifth episode was released on October 11, 2016, with 20th Anniversary World Tour published by Gearbox Software. A direct sequel titled Duke Nukem Forever was released in 2011, after fifteen years in development hell.