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In page Duke Nukem 3D:

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The shareware version 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. A fifth episode was released on October 11, 2016, with 20th Anniversary World Tour published by Gearbox Software. A sequel, Duke Nukem Forever, was released in 2011.