Informed shit test, I've actually seen guys telling women ALL about the game to try and *reserve* women so they can't be picked up. (Trying to prove that they're different and special) Never works and sometimes ruins it for the rest of us.
Must admit I've never been asked but I stopped using the cube *apart from in perfect situations* to establish rapport. Personally I would of gone with a diversionary tactic

"I have no idea but some have likened me to Brad Pitt" *strike pose* If they're determined to get it out of you *despite giggling a bit* Then just feign ignorance again like you did and say "I have no idea a female friend of mine showed me this and said it really worked"
I think the main point is that women always think your trying to game them 'in one way or another' the point of the game is to just do it in a smooth manner and to let the girl enjoy the experience of being 'wooed' by someone who understands women *more than the other schmucks*
Just think of a response to "Are you trying to hit on me?", a good one would be "Pffft, got a bit of a big head haven't you!"
So feign ignorance

, ask her to explain what it is and follow up with the same response, maybe even gently tease with "You think hordes of trained professionals are chasing after you to try and get you into bed, your modest!"
All tongue in cheek with a cheeky grin on your face

If that doesn't make her giggle and blush then eject and move on.
Hope that helps!