The Robot Costume is a vanity set added in the Halloween Update. It is obtained by opening a Goodie Bag, which are dropped by monsters during Halloween. It consists of Robot Mask, Robot Shirt, and Robot Pants.
- Due to the fact that there are multiple costumes, there's only a small chance to get this costume out of a Goodie Bag.
- When wearing this costume, the player will appear to be walking like a "robot", with hands held out and a stiff walking animation.
- Added to the game.