Lifeline, released in Japan as Operator's Side¿, is a video game
released by SCEI and Konami for the PlayStation 2. It is a horror game
in the genre similar to the Resident Evil series. Its defining aspect is
that the player controls the game entirely by using a microphone to
speak commands to on-screen characters. These commands are interpreted
by the game via speech recognition. It is generally regarded by game
reviewers as average, although its innovation has caused it to become a
cult classic among fans. The game sold well enough to become a
PlayStation 2 "greatest hit", with the lower-priced version released on
September 25, 2003 in Japan. Both versions in Japan included the option
to purchase the USB headset packaged with the game. The North American
release did not offer this bundle.