Zombie Rush Survival UPDATE: Best way I know to Earn Zombux Now

Now that I have a strong, upgraded Demolitionist class, I use it when I want to earn the most zombux in the game. Basically, just running 2-30 minutes games, back to back, you can earn from 270k-280k zombux, in just an hour of play. I believe you can still take advantage of this strategy, even if you just bought the Demolitionist Class, but you will need to use the demolitionist class to get this to work the best. Other classes are not strong enough to kill the zombies fast enough