By Brian X. Chen

Plenty of iPhone programmers whine about their failure to strike it rich in the App Store, but Tap Tap Revenge developer Tapulous can’t complain. The maker of the popular rhythm game reported sales nearing $1 million per month.

The Palo Alto, California startup told Reuters that it generates the revenue through sales of its games, ads and selling songs inside games.

Apple has sold more than 50 million iPhone OS devices (iPhones and iPod Touch units) to date. Earlier this year, research firm ComScore estimated that one-third of iPhone OS users had installed Tap Tap Revenge, Tapulous’ most popular game title. Many compare the game to Rock Band or Dance Dance Revolution. (In Tap Tap Revenge, you tap glowing dots as they hit the bottom of the screen.)

Tap Tap Revenge 3, the latest version of Tapulous’ game, is $1 in the App Store. There are free tracks, but mobile gamers have to buy some major artists’ songs for 50 cents apiece. The strategy seems to be working for artists, as well as for Tapulous.

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