From the Portal Wiki
|Worn by:||Atlas, P-body|
|Price:||$0.99 / £0.59 / 0.99€ / 30 rub|
Here, let me put on some adventure music
— Adventure Core
The Audiosurf Flag is a jiggleboned item that attaches to Atlas and P-body's antenna. It bears a drawing of the Chell avatar found in AudioSurf. It was shown for a short time during the Portal 2 ARG and was awarded if the game was played the most out of the Potato Sack games.