"How can one get 148 cities?" that's impossible, there are only 147 cities. Yeah, i know someone has a score of 148, but... you must know... that user (girl) was a cheater, she has been permanently banned from kongregate for being a cheater. The maximum number of cities is 147, not more. If you want to get all the cities (147), you should see the forum posts and the comments, you may find some usefull information for your runs.
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