The Richest Gaming Start-Ups You've Never Heard

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Estimated daily revenue from Clash of Clans: $527,389

The combat strategy game is popular in most countries, especially Russia and Switzlerland.

The Finnish developer has over a million daily users and has partnered with GungHo Online for a campaign that aims to take on bigger developers.

Supercell is valued at $770 million, according to Business Insider.