I don't know if Kobayashi works, but whenever I enter it I hear a tone, so that's telling me I entered it correctly, at least. I haven't noticed any marked difference between when I use it and when I don't, but I guess it's there for placebo effect.
Anyway, I do best with the Flagship, though I still can only barely get more than 6mil final score. You get an extra life at 2mil points, and I suppose at 4mil too. Haven't gotten there yet, but at least that helps.
11.9.2009 - 1000th achievement: Roadie, Brutal Legend
6.29.2010 - 2000th achievement: A Friend in Need, Tekken 6
2.18.2011 - 3000th achievement: Afraid of the Dark, Gears of War 2
4.29.2012 - 4000th achievement: Settlement Savior, Iron Brigade
11.29.2013 - 5000th achievement: The Challenger, Halo 4