Audiosurf
Audiosurf: co-op for up to 2 players, on PC, came out 15 February 2008.
Want to play Audiosurf with friends?
Pick a night together in Lobbli: everyone marks when they are free, and you see which evening works.
Quick answers
Is Audiosurf co-op?
Yes, Audiosurf has a co-op mode.
How many players?
Up to 2 players.
Split screen?
No split screen mode is listed for it.
When did it come out?
15 February 2008.
Which platforms?
PC.
What kind of game is it?
Music, Puzzle, Indie
Who makes it?
Dylan Fitterer
From its Steam page: co-op.
About Audiosurf
Audiosurf is a puzzle/rhythm hybrid game created by Invisible Handlebar, a personal company created by Dylan Fitterer. It's track-like stages visually mimic the music the player chooses, while the player races across several lanes collecting colored blocks that appear in sync with the music. The music used in the game is chosen from the user's own library, from almost any DRM-free format, as well as standard redbook CDs; in addition, Audiosurf includes the entire soundtrack to The Orange Box as part of the download.