Using QooApp is really simple. The interface is divided into various different tabs. In the first one, you have a list with all the video games in order of popularity, in the second, you can find a list of games that are coming out soon, and in the third tab you can see different events.
You don't need to create an account before you start downloading any games. All you have to do is tap the download button of the video game you want, wait a few seconds, and download the APK. Next thing you know, you can start playing any game you've downloaded.
QooApp is a really interesting alternative for finding video games on Android. That said, most of the games you find will be in Japanese, Chinese, or Korean. Every once in a while, you'll find a game in English ... but to be honest, there aren't many.
Android 2.3 or higher required.