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688(I) Hunter/Killer is a 1997 submarine simulator game. Developed by Sonalysts Inc. and published by Electronic Arts and more recently by Strategy First for Windows 95 compatible operating systems. It is named after the 688 (Improved) Los Angeles class of United States (SSN) submarine, and was a successor to the earlier game 688 Attack Sub. It is currently available on Valve's Steam content delivery service.