Mobile gaming has long been the redheaded stepchild of the gaming industry. Considering how there hasn’t really been a star-studded lineup of amazingly popular and successful mobile games, for a long time, mobile gaming came down to a choice between Snake or Solitaire. To be fair, cell phone gaming had a lot going against it. Multiple cell phone carriers, hundreds of handsets, differing chipsets, and no common point of purchase fragmented the market into hundreds of pieces. Tiny, low-resolution screens and a keypad meant for dialing phone numbers certainly didn't help the cause.
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Source: Gamespot