I spotted this machine back in 2016. It was sitting next to a Theatre Of Magic prototype. Perhaps this was on what used to be the official William Bally web page in which they had pictures of the machines at development stage.
Here, the No Good Gofers Page, as it was when the web site was "live" :
https://www.planetarypinball.com/mm5/Williams/games/gofers/index.html
I cannot spot the corresponding Theatre Of Magic dedicated page though.
By the way, does anybody know about the prototype NGG with the mother gopher depicted here ?
https://www.planetarypinball.com/mm5/Williams/games/gofers/funstuff.htm

World cup soccer (resized).jpg

I didn't know, merci Benoit. I thought that perhaps it would have turned into a Ringmaster-alike toy on what became Cirqus Voltaire.