O2Jam World Alternatives

Rock Band is a Rhythm Music and Single and Multiplayer video game created by Harmonix and published by MTV Games.

Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...

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World in Audition is an Addictive, Dancing and Music Simulation.

Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.

O2Jam is an Arcade, Single and Multiplayer Music Rhythm video game developed by O2Media and published by e-Games.

Bonus content.

Rocksmith builds off of the fundamentals of music games like Rock Band and Guitar Hero by offering fundamental lessons in actually playing guitar.

Rhythm game for Windows, Mac, and Linux.

Open Source

Mystery Manor is an Adventure, Puzzle, Hidden Object, and Single-player video game developed by Game Insight.

Michael Jackson: The Experience is a Rhythm, Music, Single and Multiplayer video game created and published by Ubisoft.

Osu! Tatakae! Ouendan is a Music, Single-player and Multiplayer Rhythm video game published by Nintendo for DS platform.

Adventure Escape: Space Crisis is a Superb, Adventure, Puzzle, Hidden Object and Single-player video game created and published by Haiku Games.

Fablewood by HitPoint, Inc.