Sin is a first-person shooter video game developed by Ritual Entertainment and published by Activision in 1998. It uses a modified version of the Quake II engine. Sin is set in the dystopian future of 2037, where John Blade, a commander in a security force named HardCorps in the megacity of Freeport, is tasked to rid the city of a recreational drug that may be tied to the rival biotechnology megacorporation, SinTek.