Mannhattan Project

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For the Mann vs. Machine map, see Mannhattan.
This is what happens instead of the lightbulb thing when Demoman has a bright idea!
Mannhattan Project publicity blurb

The Mannhattan Project is a community-created cosmetic item for the Demoman. It replaces the Demoman's beanie with a cap that is shaped like a yellow glowing mushroom cloud.

This item can only be worn around Halloween or during a Full Moon; at other times of the year, it does not appear in gameplay, unless the server has Halloween mode enabled. However, it can be equipped at any time and can still be viewed on the loadout screen even when it is not visible during games.

The Mannhattan Project was contributed to the Steam Workshop.

Update history

October 29, 2014 Patch (Scream Fortress 2014)

  • The Mannhattan Project was added to the game.


  • "Manhattan Project" was a research project developed by the United States of America, the United Kingdom, and Canada. Active from 1942 to 1946, it produced the world's first atomic bombs, with which the mushroom clouds are most commonly associated.