Hide your fleet, read the water, sink theirs first. Battleships runs in the browser with no download: create a room, share a five-letter code or a QR, and play live with a friend while others watch with fog of war. Three AI opponents, three rule sets (Classic, Salvo and Arsenal with sonar, torpedoes, airstrikes and shields), boards from 8×8 to 15×15, leaderboards, naval ranks and achievements. Free, works on phones, keyboard-playable, and the server keeps ship positions hidden by construction.