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2 to 4 players
Head-to-head duels or free-for-all with up to four admirals per room.
Arcadeum
Online Gaming Arena
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Online Gaming Arena
Play the classic Battleship game online — free, multiplayer
Sea Battle is the timeless naval-combat game where two or more admirals secretly place fleets on a 10×10 grid and trade salvos until only one fleet is left afloat. On Arcadeum Games you can play Sea Battle right in your browser — no download, no signup wall — with friends, strangers, or AI bots.
Head-to-head duels or free-for-all with up to four admirals per room.
Up to four teams with shared boards, private team chat, and an optional hidden-ships rule.
Classic, modern, pixel-art, cyberpunk, nebula, vintage, sunset and more.
No installs, no paywall. Open a room and share the link.
Pick a theme, invite friends or add AI bots, and choose head-to-head or team mode.
Drag your five ships onto your 10×10 grid. Ships cannot overlap or touch.
Take turns picking a cell on each opponent’s grid. Hits go red, misses go white.
The last admiral with at least one ship afloat wins the battle.
Ten board styles, your pick. Same game, different vibe — switch any time in the lobby.
Epic quests and exploration
Neon-lit dystopian future
Deep ocean depths
Noir detective underworld
Dark and terrifying atmosphere
Mountain summit expedition
Deep space exploration
Magical realms and mythical creatures
Wild West frontier
Ancient Egyptian mysteries
Victorian-era mechanical wonders
Peaceful Japanese aesthetics
Sink all enemy ships before they sink yours! The last player with ships remaining wins.
The game has two phases: Ship Placement and Battle. First, secretly place your ships on your 10×10 grid. Then take turns firing at opponent grids to find and sink their ships.
Place all 5 ships on your grid before the battle begins. Ships cannot overlap or touch each other. Click to place, rotate with the button.
On your turn, click on an opponent's grid to fire. Hits are marked red, misses are marked white. When all cells of a ship are hit, it sinks!
• Carrier (5 cells) - The largest ship • Battleship (4 cells) - Heavy cruiser • Cruiser (3 cells) - Fast strike ship • Submarine (3 cells) - Stealthy vessel • Destroyer (2 cells) - Small but nimble
Sea Battle (Battleship) is a game of probability and process of elimination. A handful of habits separate casual players from the admirals who consistently sink first.
After landing a hit, fire at adjacent cells in one of four directions until the ship sinks. The moment it goes down, return to your search pattern — confirmation of a sinking tells you which neighbouring cells are now safe to ignore.
The shortest ship is two cells long, so firing in a checkerboard pattern guarantees you will eventually touch every ship without scanning every cell. This roughly halves the cells you need to try before the first hit.
Hugging the board edge feels safe, but human opponents sweep the perimeter first because edge-placed ships have fewer escape directions. Float your fleet a cell or two off the rim.
Put each ship in its own quadrant when you can. Clustered fleets cascade — a single lucky hit hands the opponent two or three quick sinkings in a row.
Misses are information. Mentally mark the dead zones and you cut the remaining search space in half by the mid-game. Most theme boards on Arcadeum Games already show miss markers for you.
The classic strategy board game with full rules including castling, en passant, and promotion
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Classic 3-in-a-row with themed variants and 3×3 – 9×9 boards
Match by color or number, chain Draw-Two and Draw-Four cards to flood the next player, and empty your hand first to win.
Spin up a room and share the link — your fleet awaits.
Master the board with the best Battleship fleet placements, 10×10 grid tactics, parity search methods, and target hunting strategies for free online multiplayer.
A full beginner-friendly guide to Sea Battle / Battleship online: official rules, fleet setup, hunt-and-target search, and the habits that separate casual players from admirals who consistently sink first.