Karaoke Revolution allows PlayStation 2 gamers to show off their singing skills and get real-time feedback on their performances. Players sing using the Logitech PS2 Headset (or other approved PlayStation 2 USB microphone devices). The game rates the player's performance based on their vocal pitch and timing. A visual indicator shows the player's current pitch in real time and also the pitch of vocals of the original song. If the original notes of the song are too high for the player's vocal range, the game allows the player to sing at higher or lower octaves to hit the correct notes. If the player sings well, the crowd gets into the performance by clapping, cheering and dancing. If the performance is bad, the audience becomes bored and the user can get booed off the stage. The Japanese versions of the game are developed by Konami themselves. The gameplay also differs significantly. Rather than a game per se, it is merely a karaoke system for the PlayStation 2, with no judgments. The songs in the game are covers of pop hits frequently sung in karaoke bars. This contrasts with the SingStar series which features only original artist recordings along with the music videos, where available.