Overview
"4 Square" and "Astro" are two electro-mechanical pinball machines released by D. Gottlieb & Co. in 1971, sharing similar playfield designs but different themes and scoring systems. "4 Square," introduced in June 1971, has a dancing and psychedelic theme with features like two flippers, three pop bumpers, two slingshots, and eight standup targets, with a production run of 2,200 units. "Astro," the add-a-ball version released in October 1971, features an outer space and robot theme and also includes two flippers, three pop bumpers, two slingshots, and eight standup targets, but it allows players to earn extra balls instead of points.
