Play Battleship Online Free

Battleship is a two-player game of hidden information. Each player arranges a fleet of five ships on a private 10×10 grid, then the players take turns calling out coordinates. Every call comes back as a hit, a miss, or - when the last square of a vessel is struck - a sinking. The first side to destroy the opposing fleet wins.

Strip away the naval theme and what remains is a pure search problem: one hundred hiding places, five targets of known sizes, and a limited supply of guesses. Mathematicians have calculated that an efficient searcher needs around 30–35 shots on average to clear a randomly placed fleet, which is why the difference between a casual player and a sharp one is enormous - often ten salvos or more.

Unlike dice games, nothing in a Battleship duel is decided after placement except the quality of your questions. Each miss eliminates exactly one square; each hit eliminates dozens of hypotheses at once. Learning to squeeze information out of every shot is the whole game.

This page runs the game against a computer opponent in three strengths. Play happens in two phases.

• Placement: pick a ship from the list, set Horizontal or Vertical, then tap a square - the ship extends right or down from it. Squares glow gold when the fit is legal.
• Shortcuts: Random Fleet deploys everything at once, Clear wipes the board, and Rotate flips the direction of the next placement.
• Battle: tap any square on the enemy grid to fire. A red ✕ is a hit, a pale dot is a miss.
• Sinking is announced in the log - the whole hull lights up so you can picture what you destroyed.
• Turns alternate one salvo each until one fleet is completely destroyed.

Your own grid always shows your ships and every square the computer has fired at. The battle log scrolls with the full history, and session score tracks wins across rematches.

The fleet and boards are fixed: Carrier (5 squares), Battleship (4), Cruiser (3), Submarine (3) and Destroyer (2), placed on a 10×10 grid. Ships must sit fully inside the grid and may not overlap; under classic rules they are allowed to touch, and this version plays classic adjacency.

During battle, players alternate firing single shots at named coordinates such as D4. A shot either hits a ship square or misses open water. When every square of a ship has been hit, the ship is announced as sunk - you are told which vessel went down. The game ends when all five ships on one side are sunk; the other side wins. There are no special weapons, no mines and no move actions in the base game - just coordinates and consequences.

The single most valuable habit is parity shooting. Fire only at squares where the row and column numbers have the same parity - every other square of a checkerboard. Because the smallest ship covers two adjacent squares, it must straddle both colours of the checkerboard, so a full sweep cannot miss it. This alone roughly halves the search space.

• Sweep the checkerboard first; only chase after you score a hit.
• After a hit, probe orthogonally - up, down, left, right - until you find the ship's line.
• Two hits in a line means the rest of the ship lies on that line: extend it, don't wander.
• When a ship sinks, cross its squares off mentally and go back to the checkerboard.
• Late game, shrink your parity pattern: with only the 3-square ships left, you can space shots every third diagonal.

Placement strategy matters too against a smart computer: cluster ships and you hand the targeting AI chain reactions. Scattered fleets force it to start a fresh search after every kill. Diagonal placements feel clever but obey the same rules as any other layout - the length is what matters, not the angle.

The most common error is firing at random or in emotional 'hunches' after two misses - randomness is exactly what a hidden fleet wants, because unstructured shots overlap and waste turns. The second is abandoning a wounded ship: once you have one hit, that ship is the cheapest kill on the board since part of it is already mapped.

Players also forget to use sunk-ship announcements as data. When the Cruiser goes down, every square around its hull stops being prime hunting ground - big targets are gone, and the parity spacing for the remaining smaller ships should tighten. Finally, many players place the Destroyer last along an edge; edges are the first place experienced opponents sweep, so hide the little ships in the noisy middle.

This edition keeps everything that makes the pencil-and-paper game work - hidden fleets, honest hit/miss reporting, sinking announcements - and adds what paper cannot: an opponent on demand with three levels of aim. Easy fires blind. Medium hunts on the checkerboard and pounces on neighbours after a hit. Hard also extends lines of hits first and spaces its search to your smallest surviving ship, which is close to how a strong human plays.

Everything runs locally in your browser: no accounts, no downloads, no waiting for an opponent. The two grids stack neatly on phones, sit side by side on desktop, and the battle log keeps the story of the duel. Pass-and-play fans should note this is a duel against the computer by design - the hidden-fleet reveal works best when one side is a machine that cannot peek.