this game
oh my god this game
it is so fun
For those of you that don't know what Audiosurf is, come out from under that rock and hear me out. Audiosurf is a game that creates tracks based off of a sound file you load into it. There are several different "characters" (read: gamemodes) but the most common one you'll see people playing on youtube is Mono. The other characters vary in playstyles and are just pretty boring in my opinion, so I'm just going to elaborate on mono mode.
Mono is simply grab the colored blocks, avoid the grays. Uphill parts come at slower parts of the song, while downhill parts happen when it's getting intense. Simple enough, right? Depends on the song. Some songs are slow and unchallenging, even on Iron Mode. If that's the case, add tags. The tags I most often use are [as-steep] and [as-bankcam] but there are others. There's a lot, so I'll just link to them
here.
Steep made the 2142 theme in audiosurf go from this

to this

and bankcam made it look like
THIS. (Note: the track going sideways is not norma;)
To make tags, right click the .mp3 file and go to "details". Under Title, add your tags.
Like this.
