Cards vs Castles, a single-player remake of multiplayer Arcanox, a game for Android that is no longer playable
You can find Arcanox.apk at https://play.google.com/store/apps/details?id=de.juhugames.arcanox (at least in chrome) but once installed, it can't find the server to connect to the game.
The following tools are provided, which use Arcanox.apk as a skin, of sorts: