Holofleet is a roguelike deckbuilder based on the rules of Battleship. Players place a fleet drawn from nine ship classes on a grid and spend a limited energy budget each turn on multi-cell attack cards, such as Orbital Strike, Spread Salvo and Torpedo Volley, or on scouting cards like Survey Ping and Recon Drone, to locate and sink a hidden enemy fleet. Asteroid fields block lines of fire on some battlefields. Modes include a ten-mission campaign against named commanders, endless Survival waves and a branching roguelike Expedition, all playable offline against three AI difficulty tiers or in local hotseat multiplayer. Commanders level up persistently between runs.