You most likely will want to choose an optimal format for your device. If you know the type of GPU in your device, you can look at the table above to choose a format. However, if you do not know, then you can chooseAndroidorAndroid (ETC1). When you run the game, if you tap the screen with 4 fingers at once, a dialog will pop up. This dialog is usually used to enter a console command (likestat fps), but it will also display the formats that your device supports. Once you have that list, you can use that to choose an ideal type when deploying/packaging. If you choose a format that your device does not support, it will fail to load.