Geometry Wars on Project Gotham 2?

[josekortez]

How do you unlock this decidedly old-school Easter egg game on the PGR2? I was reading about it last night in an old copy of XBN magazine, and I would like to try it.

[ECWSandmanECW]

Geometry Wars
This neat little mini-game can be accessed by going into the Garage. While you're in walk mode, go over to the arcade machine and press A. - GameFAQS.com