Any game that involves active interaction with the music is a Rhythm game. That includes games where the musical beat affects game play.
Musaic Box [10.000] Votes: 16.08
Uncover all of your grandfather's sheet music hidden amongst a treasure trove of gorgeous antiques and musical relics. Piece these special compositions together and unleash their musical secrets.
Pulsr [10.000] Votes: 3.77
Pulsr lets you create music loops and beats by chain reactions. With a simple interface and an innovative concept of musical creation, anybody can create music in no time.
Vector Stunt [9.870] Votes: 69.07
Do jumps and stunts to your favorite music in this retro-styled 3D game. Vector Stunt lets you load your own mp3s and uses the music to influence gameplay.
Music Catch [9.732] Votes: 59.81
Catch the colorful shapes that appear when the music plays! The more shapes you collect, the more points you get. Yellow shapes give you a bonus and multiply your points, but watch out for red shapes!
Music Catch 2 [9.718] Votes: 81.58
Catch all the new shapes, patterns, motions, and songs in the sequel to one of the most popular music games to date. Your task is simple. Collect more shapes to receive more points.
Music Ping [9.605] Votes: 22.76
Fourth (and last that I could find) of Coolio-Niato's Music MiniGamez. Includes three levels, trophy cases and high score tables. Enjoy songs by cornandbeans and ParagonX9. See if you can get gold trophies on all 3 levels!
Super Crazy Guitar Maniac Deluxe 2 [9.413] Votes: 45.98
Everyone's favorite Guitar Hero clone "Super Crazy Guitar Maniac Deluxe" is back. Featuring 14 songs, 6 guitars, and 1 crazy stickman.
Dance Floor Destroyer [9.400] Votes: 5
Choose your DJ or import your own Meez avatar to do the spinning. You are a superstar DJ looking to keep the party rockin'. Your perfect beats will drive the vibe high and keep it there. Let the vibe go too low and you will feel it from the crowd.
Music Smash [9.301] Votes: 25.75
Third of Coolio-Niato's Music MiniGamez. This is a much harder version of Music Stomp and goes back to being keyboard controlled.
Pianist [9.169] Votes: 6.02
Piano simulator.