The Richest Gaming Start-Ups You've Never Heard

Screengrab via GungHo
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GungHo Online Entertainment

Estimated daily revenue from Puzzle Dragons (English version): $58,681

GungHo Online Entertainment began with a focus on PCs and consoles, but has expanded into mobile games in recent years.

The studio has been cranking out hits ever since, five of which were released over the past year.