Also, a level editor
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As a kid, I played hundreds of hours of Duke Nukem 3D. I even went so far as to go to local tech stores and find “level pack” CDs so I could play more maps than the game could possibly offer, and made a few of my own in my spare time.
Thankfully the Steam version of Duke 3D (the Megaton Edition) has just added Steam Workshop support and a level editor. Basically, the editor allows you to create extra maps for the community and the Workshop lets you share them — pretty simple stuff.
On its Steam page, Valve notes that there are already 60 maps available for download, all with their own rating system and mini-forum . The game is also 75% off until December 16th.