Audiosurf is similar to Guiter Hero but it uses your music thats already on the computer. it also has the Orange Box soundtrack and Audiosurf Radio songs built in. then theres your music and the characters. there are many different characters to choose from if you get the full version of the game. 3 categories: Casual- Easy, Pro-Medium, and Elite-Hard. each one is different and when using them the background colors and amount of blocks changes. anyways it's just a really cool game to play when your bored or just wanna play it. im the one who started advertising it on xfire now its being advertised on the Blockland forums, hope u Blocklanders join this game! (not forcing u too)