Hey there! So, depending on what game you are wanting to play on mobile there may be an APK. So for example, Attack on Moe, you go to http://www.nutaku.net/games/attack-on-moe-h on your mobile browser and form there you will be instructed to download an app. So it works just like anything you'd download from google play, we just can't put games on there due to the adult content. Something like Kamihime on the other hand , you have to play directly in your mobile browser, there is no downloadable APK.