|Release date||June 1971|
4 Square is a pinball machine designed by Ed Krynski and produced by Gottlieb in 1971. 4 Square is an electro-mechanical pinball machine and there were 2,200 units produced. 4 Square features 2 flippers, 3 pop bumpers, 2 slingshots and 8 standup targets. The maximum point score displayed is only 9,999 points. 
- "4 Square". Internet Pinball Machine Database.
- 4 Square at the Internet Pinball Database
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