Metropolitan Mayhem is a 15-map mod for Duke Nukem 3D (Atomic Edition). It's themetically very close to the original first and third episodes (LA Meltdown & Shrapnel City) of Duke Nukem 3D, concentrating almost exclusively on classic urban-themed maps. The original plan was to spend at most 24 hours working on each map so map sizes vary from small to medium. In total the mod should provide an hour's worth of oldskool entertainment. If you liked Duke3D, particularly its city maps, you cannot miss Metropolitan Mayhem. The mod was designed by MetHunter, MRCK, Mikko Sandt and Merlijn van Oostrum.

micky_c says

10/10 - Agree Disagree

An amazing episode that really captures the feel of the original game. I can't believe they made each map in a 24 hour period, with all the levels feeling solid and polished, with good layouts, trimming, shading and gameplay.

The maps also make use of verticality with a bit of rooftop action (we really need more quality rooftop action in Duke), and something a bit more ambitious in the penultimate level.

The maps each only take about 5-10 minutes yet really show how fun classic, vanilla Duke 3D can be, and how an experience like this really needs to be brought back with modern games. Classic Duking at its finest.
Try it out now! I can't think of a better way to spend an afternoon.