Sea Battle Beginner Tips: Place Smart, Shoot in Patterns, Sink All Five First (2026)

Last updated: September 28, 2026 · Tested on Playnesta's Sea Battle build (upstream billmei/battleboat @ e30edf2) · Goal: sink all five enemy ships before the computer sinks yours

Method: every rule below was verified against this site's playable build — constants read from the shipped game (twin 10x10 grids, five ships: carrier 5 / battleship 4 / destroyer 3 / submarine 3 / patrol boat 2, roster-click plus cell-click placement, Rotate Ship toggles orientation, Start Game unlocks when all five are placed, alternating shots with a probability-density computer that hunts with a heatmap and targets around hits, win/loss alert plus Try Again sidebar plus in-page Restart Game, stats sidebar with games won and accuracy kept in localStorage, 4-step first-visit tutorial, no audio), a headless-browser check confirmed a clean load with zero errors, twin 100-cell grids, all 5 ships placed via real clicks, a full clicked game to the terminal banner, bridge load/start/win/restart events reaching the parent page, Restart Game dealing a fresh battle, and zero errors at 390px mobile width with no sideways scroll. Controls: click or tap roster ships, your cells, and enemy cells on desktop and touch; roster and buttons are 44px tap targets. Battleship is a Hasbro trademark, so this game ships as Sea Battle.

1. Spread your fleet — touching ships sink together

The computer hunts with a probability heatmap and, once it hits, targets every neighbor of the wound. Two ships parked side by side turn one lucky hit into two discovered ships. Leave at least one cell of water between hulls in every direction: the carrier low, the patrol boat high, the rest scattered. Spreading does not hide you, but it forces the computer to finish one kill before starting the next.

2. Rotate before you place — orientation is decided at the roster

Click a roster ship, then press Rotate Ship to toggle horizontal/vertical before you click your waters: the whole hull lands from the clicked cell in the current direction, and clicking a cell commits the placement immediately. Plan each hull against the grid edges — a length-5 carrier needs five free cells from the clicked square, and the build rejects overlaps and overhangs silently, so a click that changes nothing means the spot is illegal, not broken.

3. Open with a checkerboard, not random potshots

The smallest ship is 2 cells long, so every other diagonal is guaranteed to touch something: shooting only same-color checkerboard squares finds the whole fleet in about 50 shots instead of 100. When a shot hits red, stop the pattern and probe the four neighbors until the hull turns dark (sunk), then resume the checkerboard on the remaining water. Shots are alternating — you fire, the computer answers — so every wasted shot is also a free shot for the heatmap.

4. Finish wounded ships immediately — a live ship shoots back

A damaged but floating ship keeps its guns: the computer's remaining hulls keep firing while you chase new contacts. Red means commit — sink it dark before returning to the pattern. The one exception is information: if two separate ships are both hit, finish the smaller (fewer unknown cells) first so the board simplifies fastest.

5. Watch the stats sidebar — accuracy is your skill meter

Games won and accuracy persist in your browser across visits (Reset Stats wipes them). A checkerboard opener with disciplined finishes lands near 30–40% accuracy; below 20% you are still shooting randomly. Play one Restart Game battle after reading each tip above and check the number — when accuracy climbs, the wins follow, because the computer plays the same heatmap every game and only your pattern improves.

FAQ

What is the goal of a game?

Sink all five enemy ships — carrier (5), battleship (4), destroyer (3), submarine (3), patrol boat (2) — before the computer sinks your five. Red is a hit, white with a cross is a miss, dark is a sunk hull; the result banner plus Try Again sidebar ends the game.

How do I place my ships?

Click a ship in the roster, optionally press Rotate Ship to change orientation, then click one of your cells — the whole hull lands from there. Place all five to unlock Start Game. Placement clicks on your grid never start the timer; the game starts with your first shot on enemy waters.

How does the computer aim?

Probability density: it maintains a heatmap over your waters, shoots the most likely cell, and once it hits anything it targets the neighbors until that ship sinks. It never misses a neighbor probe — so spacing your hulls apart is the only defense that works.

Can I restart quickly?

Yes — Restart Game in the Try Again sidebar (or after any game) deals an instant fresh battle with no reload. Stats carry over unless you press Reset Stats.

Does it work on mobile?

Yes — cells are DOM taps on the same grid as desktop clicks, roster and buttons are 44px targets, and the layout shrinks to 390px viewports with no sideways scroll. If the frame ever fails to load, use the "open in a new tab" fallback link under the game.

Where can I play it?

Right on this site's sea-battle page. The game is a self-hosted modification of the MIT-licensed battleboat by Bill Mei; license and attribution are listed under the game.