The Pixel Gun Arcade is a Big Decor introduced in the 16.7.0 update.
It appears to be a purple arcade in which the game is Pixel Gun 3D. There is a banner of the game on the side with the title and Newbie on it. There is also a screen with a joystick and some other controls. The screen indicates the player in the first person equipped with the Pixel Gun, aiming at the zombie.
Apparently, it has no use and is just used for cosmetic purposes.
- Pixel Gun 3D never had an arcade game in real life, because the game wasn't out in the 80's. It was out only in 2013.