The Richest Gaming Start-Ups You've Never Heard

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Estimated daily revenue from Kakao: $26,960

The mobile board game 모두의마블 for Kakao is a lot like Monopoly. The gaming platform's users number 30 million, with many coming from the messaging network Kakao Talk.

When the platform launched last July, it only had 10 games from seven developers. Today there are close to 200 products from 99 designers.