First of all, the original Mountain Dew is the worst. Code Red, Pitch Black, MDX, Game Fuel, Baja Blast, and especially LIVEFUCKINGWIRE are awesome.
Second of all, Game Fuel has like 33% more caffeine than any of the other variations. I felt like shooting shit after drinking it. I also felt like running into walls and fucking up shit. Whenever Halo 3 comes out, I'm going to have a case beside me, so I can rape 12 year old's childhoods for like three days straight online whenever they use dirty words and act all big because Mommy bought them a grown up game.