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.
- 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.