Palace Arcade

Beginning of the season 2 introduced the Palace Arcade. 

Will was drawn to the Upside Down while being at the arcade with his friends Mike, Dustin and Lucas.

In this set there's the regular world arcade and the Upside Down arcade.

The interior has some arcade machines and  a Bill-to-Coin changer. 

The building was designed based on the real world location where the arcade scenes were filmed: 

From the tiling of the floors to the cool shaped doorways and the coloring of the building.