If you want to understand why Zynga is struggling, look no further than a recent report from App Annie, an analytics firm that tracks Android and iOS apps.
While Zynga has far and away the biggest audience for social games and rakes in cash from its Facebook titles, it has openly admitted that it has had a hard time making money on mobile.
And it's not like other American companies are ruling the charts—Zynga archrival Electronic Arts has just one title in the top 10.
It turns out that the real success stories in mobile games are scattered around the world. The best moneymakers are from companies in Finland, Sweden, Japan, and South Korea. Maybe you haven't heard of them—but you've probably played one of their games.
10. Diffusion Million Arthur
Publisher: Square Enix
A Japanese anime-style card game.
9. DragonVale
Publisher: Backflip Studios
DragonVale, a game in which you breed your own pet dragon, was released in September 2011 by Backflip, a studio based in Boulder, Colo. It's still going strong.
8. Minecraft
Publisher: Mojang
Minecraft started out as a PC game, but its Swedish publisher revealed that mobile versions of the building-blocks game outsold desktop and game-console versions last year.
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