To install APK games on your Android phone do the following:
1. Go to Android Market and search for the Apps Installer, App Installer, z-App Installer or Fast Installer application.
2. Open it and click on the Install button.
3. Copy the .APK file you want to install to the root directory of your phone's memory card and insert the card into your Android phone.
4. Open the App Installer on your phone. It will show you all the .APK files stored in your memory card.
5. Just click on the game you want to install and it will be installed.