Brine Casemate

The barrel sweeps on its own. Tap the yard and a shell leaves along the barrel. Tap again while it is flying and the shell bursts. Stones stop a shell until they crack. A heavy ram fires back. Clear the quota and bring down every ram. If the plates are gone, that yard can be played again. Eight yards follow, each a little tighter.

Brine Casemate is a single-player pastime with no account and no real-world goods.