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.
6. Kingdom of Camelot: Battle for the North
Publisher: Kabam
This kingdom-building simulation is a big hit for Kabam, a Silicon Valley games startup that has raised $125 million from investors including Google and Intel.
5. Candy Crush Saga
Publisher: King.com
This British publisher has challenged Zynga on Facebook games—but on mobile, it's just crushing it.
4. Hay Day
Publisher: Supercell
FarmVille players might find some parts of this Finnish games maker's agricultural simulation familiar. But Inside Social Games has actually said that Zynga's FarmVille 2 sequel is "reminiscent" of Hay Day. Never mind who's copying whom—Hay Day's a hit.
3. Puzzle and Dragons
Publisher: GungHo Online
This popular puzzle game may be generating between $54 million and $75 million a month, according to reports of GungHo's financials. (That's for both iOS and Android versions.)
2. The Simpsons: Tapped Out
Publisher: Electronic Arts
A familiar brand name and voiceovers from the real actors behind the cartoon characters helped this game overcome a rocky launch.
1. Clash of Clans
Publisher: Supercell
Another financial hit for the Finns—this medieval battle game is reportedly making more than $1 million a day. The secret: carefully rolling out features so new users don't get overwhelmed.