Special Criminal Investigation, known often simply as S.C.I., is a action-driving game released by Taito for the arcades in 1989. It was subsequently ported a variety of consoles and computers including the Sega Master System in 1992. Special Criminal Investigation is a sequel to Chase H.Q., with some versions of the game going so far as to call it Chase H.Q. II: Special Criminal Investigation. Aside from being part of the same series, it is unrelated to the Sega Mega Drive game Chase H.Q. II.
