Many developers are waiting for news of the first wave of commercially successful games on Android.

The size of market in terms of millions of devices suggests this must happen soon, although the state of the Android Market suggests it might happen later.

Signs of life have been found however by US developer DistinctDev with its brain training game The Moron Test.

I'm with stupid

Launched less than two months ago, the free Lite version been downloaded more than 700,000 times from the Android Market, while the 99c paid version of The Moron Test has been downloaded over 65,000 times.

This makes it the ninth most popular paid app on Android, and DistinctDev says over 50 percent of the sales have generated from the free version.

Indeed, despite a historic conversion rate of around 4.5 percent, the company says the rate has recently increased to an impressive 7 percent.

A free Lite version of the game has also been released on Apple's App Store to similarly support the 99c paid iOS version.

"Seeing these results on the Android platform convinced us that a Lite version for iTunes App Store was essential," says Berkeley Malagon, president and CEO of DistinctDev.

"We're excited about comparing the performance across the two platforms and sharing the results with the community."