Thats chinese handball! or ace, king, queen. I dont remember it being called slug. Names of games changed in all areas of ny in the 1960’s.In QUEENS it was,hey you wanna play ‘chinese’. We played in the school park against the brick wall of a park bathroom building.We used a spaldeen.It was a very fast game,played low to the ground,and wore out alot of Keds sneakers. You had to find a good place with a wall or fence in back of you,so you didnt have to chase the ball.