Just Fun was a small arcade adjacent to a theater in the Berkshire Mall, formerly located in Lanesborough, MA. It was part of a much larger company called Weyman Enterprises (New Rochelle, NY), that operated 96 locations in the Northeast in the late 1980's. Just Fun opened with the mall in 1988. It's 53 games ran on quarters. No firm date of closure is known, but the mall closed its doors in 2019.
Reference:
https://www.newspapers.com/article/the-berkshire-eagle-just-fun-arcade-in-p/169016653/